1W051A CDC Volume 1

1. What air mass forms over land only during the summer?

MTk.

MPw.

CPk.

CT.

Located on page 1-54

Explanation

Located on page 1-54

2. A decrease of mass in a column of air will cause the surface pressure to

Increase.

Decrease.

Remain steady.

Do nothing, pressure is not affected by mass.

When there is a decrease in mass in a column of air, it means that there is less air present in that column. As a result, the air molecules are less densely packed, leading to a decrease in pressure. This decrease in mass causes a decrease in the surface pressure.

Explanation

When there is a decrease in mass in a column of air, it means that there is less air present in that column. As a result, the air molecules are less densely packed, leading to a decrease in pressure. This decrease in mass causes a decrease in the surface pressure.

3. Which orographic cloud resembles an almond or a fish?

Rotor.

Lenticular.

Foehn wall.

Castellanus.

Lenticular clouds are formed when moist air flows over a mountain or hill and creates a series of standing waves. These clouds are lens-shaped and often have a smooth, rounded appearance, resembling an almond or a fish. They are commonly found in the lee of mountains and can indicate strong winds and turbulence in the atmosphere.

Explanation

Lenticular clouds are formed when moist air flows over a mountain or hill and creates a series of standing waves. These clouds are lens-shaped and often have a smooth, rounded appearance, resembling an almond or a fish. They are commonly found in the lee of mountains and can indicate strong winds and turbulence in the atmosphere.

4. "Clouds or obscuring phenomena that have bases at the same approximate level" is the definition of

Sky condition.

Sky cover.

A ceiling.

A layer.

The definition provided, "Clouds or obscuring phenomena that have bases at the same approximate level," describes a layer. A layer refers to a type of cloud formation where clouds or other obscuring phenomena are present at the same height or altitude. This term is commonly used in meteorology to describe a specific type of cloud formation in the atmosphere.

Explanation

The definition provided, "Clouds or obscuring phenomena that have bases at the same approximate level," describes a layer. A layer refers to a type of cloud formation where clouds or other obscuring phenomena are present at the same height or altitude. This term is commonly used in meteorology to describe a specific type of cloud formation in the atmosphere.

5. How do you report prevailing visibility at US stations and overseas stations?

Meters for both.

Statute miles for both.

Statute miles for US stations and meters for overseas stations.

Meters for US stations and statute miles for overseas stations.

The prevailing visibility at US stations is reported in statute miles, while at overseas stations it is reported in meters. This means that in the US, visibility is measured and reported in miles, whereas in other countries it is measured and reported in meters.

Explanation

The prevailing visibility at US stations is reported in statute miles, while at overseas stations it is reported in meters. This means that in the US, visibility is measured and reported in miles, whereas in other countries it is measured and reported in meters.

6. To properly report the visibility for more than one sector, you would list the sectors in a

Clockwise direction starting with the northernmost sector.

Clockwise direction starting with the southernmost sector.

Counterclockwise direction starting with the northernmost sector.

Counterclockwise direction starting with the southernmost sector.

To properly report the visibility for more than one sector, it is important to list the sectors in a clockwise direction starting with the northernmost sector. This ensures consistency and clarity in reporting the visibility for each sector. By following a clockwise direction, it becomes easier to identify and communicate the visibility for each sector in a systematic manner. Starting with the northernmost sector also helps in maintaining a logical order while reporting the visibility for multiple sectors.

Explanation

To properly report the visibility for more than one sector, it is important to list the sectors in a clockwise direction starting with the northernmost sector. This ensures consistency and clarity in reporting the visibility for each sector. By following a clockwise direction, it becomes easier to identify and communicate the visibility for each sector in a systematic manner. Starting with the northernmost sector also helps in maintaining a logical order while reporting the visibility for multiple sectors.

7. What is the intensity of snow which restricts visibility to less than 1/4 mile?

Light.

Moderate.

Heavy.

Intense.

The correct answer is "Heavy" because heavy snowfall significantly reduces visibility to less than 1/4 mile. This means that the snow is falling at a high rate and accumulating quickly, making it difficult to see and navigate through.

Explanation

The correct answer is "Heavy" because heavy snowfall significantly reduces visibility to less than 1/4 mile. This means that the snow is falling at a high rate and accumulating quickly, making it difficult to see and navigate through.

8. "Jet fingers"

Often develop more than 400 miles apart.

Suggest that the jet stream is beginning to dissipate.

Are somewhat rare and usually occur either singly or in pairs.

Are formed during periods when the jet stream is well organized and the core exceeds 100kts.

Located on page 1-37

Explanation

Located on page 1-37

9. An increase of mass in a column of air will cause the surface pressure to

Increase.

Decrease.

Remain steady.

Do nothing, pressure is not affected by mass.

When the mass of a column of air increases, it means that there is more air in that column. As a result, the air molecules become more densely packed, leading to an increase in pressure. This is because the weight of the additional air molecules exerts a greater force on the surface, causing the surface pressure to increase.

Explanation

When the mass of a column of air increases, it means that there is more air in that column. As a result, the air molecules become more densely packed, leading to an increase in pressure. This is because the weight of the additional air molecules exerts a greater force on the surface, causing the surface pressure to increase.

10. When the central pressure of an anticyclone is rising, you can infer the anticyclone is

Filling.

Building.

Deepening.

Weakening.

When the central pressure of an anticyclone is rising, it indicates that the air in the anticyclone is becoming denser and sinking, which leads to the strengthening and expansion of the anticyclone. This process is known as building. Therefore, the correct answer is building.

Explanation

When the central pressure of an anticyclone is rising, it indicates that the air in the anticyclone is becoming denser and sinking, which leads to the strengthening and expansion of the anticyclone. This process is known as building. Therefore, the correct answer is building.

11. Unstable waves are classified as

Barotropic highs.

Barotropic lows.

Baroclinic high.

Baroclinic lows.

Unstable waves are classified as baroclinic lows. Baroclinic refers to the condition where there is a gradient in temperature or density within a fluid. In the case of unstable waves, there is a significant difference in temperature or density between adjacent air masses, leading to the formation of low-pressure systems. These baroclinic lows are characterized by strong vertical wind shear and can cause severe weather conditions such as storms and cyclones.

Explanation

Unstable waves are classified as baroclinic lows. Baroclinic refers to the condition where there is a gradient in temperature or density within a fluid. In the case of unstable waves, there is a significant difference in temperature or density between adjacent air masses, leading to the formation of low-pressure systems. These baroclinic lows are characterized by strong vertical wind shear and can cause severe weather conditions such as storms and cyclones.

12. In the life cycle of a low, the wave will reach its maximum intensity in the

Mature stage.

Dissipation stage.

Wave initiation stage.

Wave intensification stage.

In the life cycle of a low, the wave will reach its maximum intensity in the mature stage. This is because during this stage, the low pressure system is fully developed and has reached its peak strength. The associated weather conditions, such as strong winds and heavy precipitation, are at their most intense during this stage. After the mature stage, the low pressure system will gradually weaken and dissipate. Therefore, the correct answer is the mature stage.

Explanation

In the life cycle of a low, the wave will reach its maximum intensity in the mature stage. This is because during this stage, the low pressure system is fully developed and has reached its peak strength. The associated weather conditions, such as strong winds and heavy precipitation, are at their most intense during this stage. After the mature stage, the low pressure system will gradually weaken and dissipate. Therefore, the correct answer is the mature stage.

13. What causes a surface high to build during the self-development process?

Negative vorticity advection.

Positive vorticity advection.

Convergence aloft.

Divergence aloft.

During the self-development process, a surface high builds due to convergence aloft. Convergence aloft refers to the horizontal movement of air towards a central point in the upper levels of the atmosphere. This convergence leads to the sinking of air, which in turn creates high pressure at the surface. As air sinks, it warms and becomes denser, resulting in the formation of a high-pressure system. Therefore, convergence aloft is the cause of a surface high during the self-development process.

Explanation

During the self-development process, a surface high builds due to convergence aloft. Convergence aloft refers to the horizontal movement of air towards a central point in the upper levels of the atmosphere. This convergence leads to the sinking of air, which in turn creates high pressure at the surface. As air sinks, it warms and becomes denser, resulting in the formation of a high-pressure system. Therefore, convergence aloft is the cause of a surface high during the self-development process.

14. The best way to distinguish stratocumulus from altocumulus clouds is to use

Movement.

Appearance.

The color of the elements.

The size of the elements.

The best way to distinguish stratocumulus from altocumulus clouds is by looking at the size of the elements. Stratocumulus clouds are characterized by larger, more rounded elements, while altocumulus clouds have smaller, more fragmented elements. By observing the size of the cloud elements, one can differentiate between these two cloud types.

Explanation

The best way to distinguish stratocumulus from altocumulus clouds is by looking at the size of the elements. Stratocumulus clouds are characterized by larger, more rounded elements, while altocumulus clouds have smaller, more fragmented elements. By observing the size of the cloud elements, one can differentiate between these two cloud types.

15. The distinguishing feature of any tornadic activity is

Intense thunderstorm activity.

Wind gusts over 35 knots in speed.

Cumulonimbus mammatus clouds.

The funnel-shaped appendage that hangs from the base of the cloud.

Tornadic activity is characterized by the presence of a funnel-shaped appendage that hangs from the base of the cloud. This funnel-shaped appendage is commonly known as a tornado. It is formed when a rotating column of air extends from the base of a cumulonimbus cloud to the ground. This feature is distinct and easily recognizable, making it the distinguishing feature of tornadic activity. The other options, such as intense thunderstorm activity, wind gusts over 35 knots, and cumulonimbus mammatus clouds, may be associated with tornadic activity but are not unique to it.

Explanation

Tornadic activity is characterized by the presence of a funnel-shaped appendage that hangs from the base of the cloud. This funnel-shaped appendage is commonly known as a tornado. It is formed when a rotating column of air extends from the base of a cumulonimbus cloud to the ground. This feature is distinct and easily recognizable, making it the distinguishing feature of tornadic activity. The other options, such as intense thunderstorm activity, wind gusts over 35 knots, and cumulonimbus mammatus clouds, may be associated with tornadic activity but are not unique to it.

16. Above 13 miles, the radiation from the sun breaks down the oxygen in the atmosphere into

Ozone gas

Argon gas

Carbon dioxide

Gaseous nitrogen

Located on page 1-4

Explanation

Located on page 1-4

17. A high-pressure system undergoes anticyclolysis when the clockwise circulation area

Decreases or disappears.

Increases or disappears.

Decreases or forms.

Increases or forms.

Anticyclolysis refers to the dissipation or weakening of a high-pressure system. This occurs when the clockwise circulation area of the system decreases or disappears. In other words, the system loses its organized circulation pattern, resulting in a decrease or complete disappearance of the clockwise flow. This can happen due to various factors such as changes in atmospheric conditions or interactions with other weather systems.

Explanation

Anticyclolysis refers to the dissipation or weakening of a high-pressure system. This occurs when the clockwise circulation area of the system decreases or disappears. In other words, the system loses its organized circulation pattern, resulting in a decrease or complete disappearance of the clockwise flow. This can happen due to various factors such as changes in atmospheric conditions or interactions with other weather systems.

18. A thunderstorm officially ends

Ten minutes after the last occurrence of thunder, hail, or lightning.

Immediately after the last occurrence of thunder, hail, or lightning.

Fifteen minutes after the last occurrence of thunder, hail, or lightning.

Twenty minutes after the last occurrence of thunder, hail, or lightning.

A thunderstorm officially ends fifteen minutes after the last occurrence of thunder, hail, or lightning. This means that once there is no more thunder, hail, or lightning activity for fifteen minutes, the storm is considered to be over. This time period allows for any potential lingering activity to completely dissipate before declaring the end of the storm.

Explanation

A thunderstorm officially ends fifteen minutes after the last occurrence of thunder, hail, or lightning. This means that once there is no more thunder, hail, or lightning activity for fifteen minutes, the storm is considered to be over. This time period allows for any potential lingering activity to completely dissipate before declaring the end of the storm.

19. The three circulation cells in the three-cell circulation theory are

Subtropical, Hadley, and Ferrel.

Polar, subtropical, and Hadley.

Subtropical, polar, and Ferrel.

Polar, Hadley, and Ferrel.

Located on page 1-13

Explanation

Located on page 1-13

20. If you throw a ball towards a stationary target from the window of a speeding vehicle, coriolis force will cause the ball to miss the target

To the right.

To the left.

Downward.

Upward.

Located on page 1-15

Explanation

Located on page 1-15

21. The simplest method for locating the 500 millibar frontal zone is to

Locate the 500 millibar maximum wind band.

Locate the position of the -11° Centigrade isotherm

Locate the position of the -17° Centigrade isotherm

Find where the thermal concentration is more than 5° Centigrade in 200 miles.

Located on page 1-35

Explanation

Located on page 1-35

22. What air mass calssification signifies an unstable, maritime tropical air mass that is colder than the surface it is moving over?

MTwu.

MTws.

MTku.

MTks.

Located on page 1-51

Explanation

Located on page 1-51

23. What air mass classification signifies a stable, continental polar air mass that is warmer than the surface it is moving over?

CPks.

CPws.

CTws.

CTku.

Located on page 1-51

Explanation

Located on page 1-51

24. It is winter. A cPk air mass is moving over the great lakes. In this situation, the southern shores of the Great Lakes will experience

Hail.

Heavy snow.

Thunderstorms.

Freezing precipitation.

Located on page 1-59

Explanation

Located on page 1-59

25. Continental tropical air masses are usually associated with

Thermal lows.

Thermal highs.

Migratory lows.

Migratory highs.

Located on page 1-61

Explanation

Located on page 1-61

26. The damper effect is comprised of upper-level

Divergence and surface low pressure.

Divergence and surface high pressure.

Convergence and surface low pressure.

Convergence and surface high pressure.

The damper effect refers to a meteorological phenomenon where the convergence of air masses and the presence of high surface pressure result in the suppression or reduction of atmospheric motion. In this case, the correct answer is convergence and surface high pressure, as it accurately describes the conditions required for the damper effect to occur. When air masses converge and there is high pressure at the surface, it leads to stable atmospheric conditions and limits the vertical motion of air, dampening any potential disturbances or weather systems.

Explanation

The damper effect refers to a meteorological phenomenon where the convergence of air masses and the presence of high surface pressure result in the suppression or reduction of atmospheric motion. In this case, the correct answer is convergence and surface high pressure, as it accurately describes the conditions required for the damper effect to occur. When air masses converge and there is high pressure at the surface, it leads to stable atmospheric conditions and limits the vertical motion of air, dampening any potential disturbances or weather systems.

27. A low-pressure system undergoing cyclogenesis is said to be

Dissipating or deepening.

Forming or deepening.

Dissipating or filling.

Forming or filling.

When a low-pressure system undergoes cyclogenesis, it means that it is forming or intensifying. The term "forming" refers to the process of a low-pressure system developing and becoming more organized, while "deepening" indicates that the system is strengthening and the central pressure is decreasing. Therefore, the correct answer is "forming or deepening."

Explanation

When a low-pressure system undergoes cyclogenesis, it means that it is forming or intensifying. The term "forming" refers to the process of a low-pressure system developing and becoming more organized, while "deepening" indicates that the system is strengthening and the central pressure is decreasing. Therefore, the correct answer is "forming or deepening."

28. In a warm frontal occlusion, the coldest air is found

Ahead of the cold front.

Behind the cold front.

Ahead of the warm front.

Behind the warm front.

In a warm frontal occlusion, the coldest air is found ahead of the warm front. This is because warm frontal occlusions occur when a warm air mass moves into an area of colder air. As the warm air rises over the colder air, it cools and condenses, creating clouds and precipitation. The coldest air is typically found ahead of the warm front, where the warm air is still rising and the cold air is being pushed up and over it.

Explanation

In a warm frontal occlusion, the coldest air is found ahead of the warm front. This is because warm frontal occlusions occur when a warm air mass moves into an area of colder air. As the warm air rises over the colder air, it cools and condenses, creating clouds and precipitation. The coldest air is typically found ahead of the warm front, where the warm air is still rising and the cold air is being pushed up and over it.

29. Which high cloud classification is also referred to as a mackerel sky?

Cirrus-H4.

Cirrostratus-H6.

Cirrostratus-H7.

Cirrocumulus-H9.

Cirrocumulus clouds are often referred to as a mackerel sky due to their appearance, which resembles the scales of a fish or the patterns on a mackerel. These clouds are high-level clouds, composed of small white or gray patches or ripples, and are usually seen in fair weather conditions. They are formed by the rising of moist air in the upper atmosphere, which then condenses and freezes into ice crystals, creating the distinct mackerel-like pattern. Therefore, Cirrocumulus-H9 is the correct answer.

Explanation

Cirrocumulus clouds are often referred to as a mackerel sky due to their appearance, which resembles the scales of a fish or the patterns on a mackerel. These clouds are high-level clouds, composed of small white or gray patches or ripples, and are usually seen in fair weather conditions. They are formed by the rising of moist air in the upper atmosphere, which then condenses and freezes into ice crystals, creating the distinct mackerel-like pattern. Therefore, Cirrocumulus-H9 is the correct answer.

30. What type of precipitation might you observe with clear skies?

Snow.

Ice crystals.

Ice pellets.

Snow grains.

Clear skies typically indicate a lack of clouds, which means that there is little moisture in the air. In such conditions, it is unlikely to observe precipitation like snow, ice pellets, or snow grains, as these require the presence of clouds. However, ice crystals can still form in the atmosphere even without clouds, usually due to very cold temperatures. Therefore, ice crystals would be the most plausible type of precipitation to observe with clear skies.

Explanation

Clear skies typically indicate a lack of clouds, which means that there is little moisture in the air. In such conditions, it is unlikely to observe precipitation like snow, ice pellets, or snow grains, as these require the presence of clouds. However, ice crystals can still form in the atmosphere even without clouds, usually due to very cold temperatures. Therefore, ice crystals would be the most plausible type of precipitation to observe with clear skies.

31. Precipitation is reported to the nearest

0.001 of an inch.

0.01 of an inch.

0.10 of an inch.

0.05 of an inch.

Precipitation is reported to the nearest 0.01 of an inch. This means that when measuring the amount of precipitation, the value is rounded to the nearest hundredth of an inch. This level of precision allows for more accurate reporting of rainfall or snowfall measurements.

Explanation

Precipitation is reported to the nearest 0.01 of an inch. This means that when measuring the amount of precipitation, the value is rounded to the nearest hundredth of an inch. This level of precision allows for more accurate reporting of rainfall or snowfall measurements.

32. Centrifugal force will increase when there is a decrease in

Mass.

Centripetal force.

The speed of rotation.

The radius of rotation.

Located on page 1-15

Explanation

Located on page 1-15

33. When an inactive front passes your station, the dew points will

Decrease slowly with the passage.

Decrease sharply with the passage.

Increase slowly with the passage.

Increase sharply with the passage.

When an inactive front passes a station, the dew points decrease sharply with the passage. This is because an inactive front is associated with cooler air replacing warmer air. As the front moves through, the cooler air displaces the warmer air, causing the dew points to decrease rapidly.

Explanation

When an inactive front passes a station, the dew points decrease sharply with the passage. This is because an inactive front is associated with cooler air replacing warmer air. As the front moves through, the cooler air displaces the warmer air, causing the dew points to decrease rapidly.

34. For observing purposes, five hydrometers are considered to be obstructions to vision. They include mist, fog, blowing snow,

Blowing spray, and blowing sand.

Freezing fog, and blowing sand.

Freezing fog, and blowing dust.

Freezing fog, and blowing spray.

The correct answer is freezing fog and blowing spray. These two weather conditions, freezing fog and blowing spray, can obstruct vision and make it difficult to see clearly. Mist, fog, blowing snow, and blowing sand are also mentioned in the question, but they are not considered obstructions to vision.

Explanation

The correct answer is freezing fog and blowing spray. These two weather conditions, freezing fog and blowing spray, can obstruct vision and make it difficult to see clearly. Mist, fog, blowing snow, and blowing sand are also mentioned in the question, but they are not considered obstructions to vision.

35. How many degrees centigrade does the temperature decrease per 1,000 meters of altitude in the troposphere?

3.5

4.5

5.5

6.5

Located on page 1-3

Explanation

Located on page 1-3

36. The driving mechanism that is mainly responsible for the earth's large-scale atmospheric circulations is the

Unequal heating of the earth.

Rotation of the earth.

Hadley cell.

Polar cell.

Located on page 1-12

Explanation

Located on page 1-12

37. In relation to the jet core, the greatest vertical wind shear is usually located

Above the strongest horizontal shear.

Below the strongest horizontal shear.

Above the jet core.

Below the jet core.

located on page 1-32

Explanation

located on page 1-32

38. What factors must a region possess in order to facilitate air mass formation?

Uniform surface, stagnant air, and large-scale difluent flow.

Must be over water, stagnant air, and large-scale difluent flow.

Any nonuniform surface, stagnant air, and large-scale difluent flow.

Must be over smooth land, stagnant air, and large-scale difluent flow.

Located on page 1-49

Explanation

Located on page 1-49

39. With the passage of a cold front in the Northern Hemisphere, the horizontal wind direction will

Become more variable.

Become more northeasterly.

Shift in a clockwise direction.

Shift in a counterclockwise direction.

When a cold front passes through the Northern Hemisphere, the wind direction shifts in a clockwise direction. This is because cold fronts typically bring cooler air from the north, which causes the wind to rotate in a clockwise direction around the low-pressure system associated with the front. As the cold air replaces the warm air, the wind shifts from its previous direction to a more clockwise direction.

Explanation

When a cold front passes through the Northern Hemisphere, the wind direction shifts in a clockwise direction. This is because cold fronts typically bring cooler air from the north, which causes the wind to rotate in a clockwise direction around the low-pressure system associated with the front. As the cold air replaces the warm air, the wind shifts from its previous direction to a more clockwise direction.

40. In a cold occlusion, the coldest air is found

Behind the cold front.

Behind the warm front.

Ahead of the cold front.

Ahead of the warm front.

In a cold occlusion, the coldest air is found behind the cold front. This is because in a cold occlusion, a cold front overtakes a warm front, causing the colder air to push underneath the warmer air. As the cold front moves forward, it brings the coldest air with it, creating a boundary between the colder air behind the front and the warmer air ahead of it. Therefore, the coldest air is located behind the cold front in a cold occlusion.

Explanation

In a cold occlusion, the coldest air is found behind the cold front. This is because in a cold occlusion, a cold front overtakes a warm front, causing the colder air to push underneath the warmer air. As the cold front moves forward, it brings the coldest air with it, creating a boundary between the colder air behind the front and the warmer air ahead of it. Therefore, the coldest air is located behind the cold front in a cold occlusion.

41. The most desirable night-visibility markers are

Unfocused lights.

Dark-colored objects.

Light-colored objects.

Focused high-intensity lights.

Unfocused lights are the most desirable night-visibility markers because they provide a broader and more diffuse illumination, which helps to enhance visibility in low light conditions. Unlike focused high-intensity lights that have a narrow beam, unfocused lights spread the light over a wider area, making it easier to see and be seen in the dark. Dark-colored objects may blend into the background and be difficult to distinguish, while light-colored objects may not provide enough contrast in low light situations. Therefore, unfocused lights are the best option for maximizing visibility at night.

Explanation

Unfocused lights are the most desirable night-visibility markers because they provide a broader and more diffuse illumination, which helps to enhance visibility in low light conditions. Unlike focused high-intensity lights that have a narrow beam, unfocused lights spread the light over a wider area, making it easier to see and be seen in the dark. Dark-colored objects may blend into the background and be difficult to distinguish, while light-colored objects may not provide enough contrast in low light situations. Therefore, unfocused lights are the best option for maximizing visibility at night.

42. The three main forms of precipitation are liquid,

Frozen, and round.

Freezing, and mixed.

Freezing, and frozen.

Freezing, and gaseous.

The correct answer is "freezing, and frozen." This answer accurately identifies the two main forms of precipitation. Freezing refers to when precipitation falls as liquid but freezes upon contact with a surface, such as freezing rain or freezing drizzle. Frozen refers to precipitation that falls in the form of ice crystals, such as snow or hail.

Explanation

The correct answer is "freezing, and frozen." This answer accurately identifies the two main forms of precipitation. Freezing refers to when precipitation falls as liquid but freezes upon contact with a surface, such as freezing rain or freezing drizzle. Frozen refers to precipitation that falls in the form of ice crystals, such as snow or hail.

43. Which type of obstruction to vision is classified as a lithometer?

Fog.

Ash.

Smoke.

Spray.

A lithometer is a device used to measure the opacity or density of smoke. Therefore, smoke is classified as a lithometer because it obstructs vision and can be measured using this device. Fog, ash, and spray are not specifically classified as lithometers, although they can also obstruct vision.

Explanation

A lithometer is a device used to measure the opacity or density of smoke. Therefore, smoke is classified as a lithometer because it obstructs vision and can be measured using this device. Fog, ash, and spray are not specifically classified as lithometers, although they can also obstruct vision.

44. Which is a calculated sea-level pressure in inches of mercury?

Station pressure.

Altimeter setting.

Sea-level pressure.

Corrected aneroid reading.

The altimeter setting is a calculated sea-level pressure in inches of mercury. It is used to adjust the altimeter reading to reflect the current atmospheric pressure at sea level, allowing for accurate altitude measurements. The altimeter setting takes into account factors such as temperature and humidity to provide a standardized pressure reference for pilots and meteorologists.

Explanation

The altimeter setting is a calculated sea-level pressure in inches of mercury. It is used to adjust the altimeter reading to reflect the current atmospheric pressure at sea level, allowing for accurate altitude measurements. The altimeter setting takes into account factors such as temperature and humidity to provide a standardized pressure reference for pilots and meteorologists.

45. Wind observing equipment is oriented to

True north.

True south.

Magnetic north.

Magnetic south.

Wind observing equipment is oriented to magnetic north because the Earth's magnetic field affects the direction of the wind. Magnetic north is the direction towards the Earth's magnetic north pole, which is slightly different from true north. By aligning the equipment with magnetic north, it allows for accurate measurement and recording of wind direction relative to the Earth's magnetic field. This is important for various applications such as weather forecasting, aviation, and navigation.

Explanation

Wind observing equipment is oriented to magnetic north because the Earth's magnetic field affects the direction of the wind. Magnetic north is the direction towards the Earth's magnetic north pole, which is slightly different from true north. By aligning the equipment with magnetic north, it allows for accurate measurement and recording of wind direction relative to the Earth's magnetic field. This is important for various applications such as weather forecasting, aviation, and navigation.

46. Which force is the "equal and opposite reaction" to the center-seeking force?

Inertia.

Coriolis.

Centrifugal.

Centripetal.

Located on page 1-14

Explanation

Located on page 1-14

47. The jet core that is located between the midlatitude and the tropical tropoause's is called the

Tropical jet.

Subtropical jet.

Polar-front jet.

Midlatitude jet.

Located on page 1-35

Explanation

Located on page 1-35

48. Anticyclogenesis typically occurs at, and just downstream from, long-wave

Ridges under difluent flow aloft.

Troughs under difluent flow aloft.

Ridges under confluent flow aloft.

Troughs under confluent flow aloft.

Anticyclogenesis refers to the formation of an anticyclone, which is a high-pressure system characterized by descending air and clockwise rotation in the Northern Hemisphere. This process typically occurs at, and just downstream from, long-wave ridges. Confluent flow aloft refers to the convergence of air masses, where the wind flow comes together. In the context of anticyclogenesis, ridges under confluent flow aloft create favorable conditions for the development of high-pressure systems. Therefore, the correct answer is "ridges under confluent flow aloft."

Explanation

Anticyclogenesis refers to the formation of an anticyclone, which is a high-pressure system characterized by descending air and clockwise rotation in the Northern Hemisphere. This process typically occurs at, and just downstream from, long-wave ridges. Confluent flow aloft refers to the convergence of air masses, where the wind flow comes together. In the context of anticyclogenesis, ridges under confluent flow aloft create favorable conditions for the development of high-pressure systems. Therefore, the correct answer is "ridges under confluent flow aloft."

49. What color balloon would you use to determine the ceiling heights of thin clouds?

Red.

Blue.

Black.

Yellow.

Red is the correct answer because red light has a longer wavelength compared to other colors, making it less likely to be scattered by small particles in the atmosphere. This allows red light to penetrate thin clouds more effectively, making it easier to determine the height of the cloud ceiling.

Explanation

Red is the correct answer because red light has a longer wavelength compared to other colors, making it less likely to be scattered by small particles in the atmosphere. This allows red light to penetrate thin clouds more effectively, making it easier to determine the height of the cloud ceiling.

50. A sudden increase of wind speed of at least 16 knots and a sustained average of 22 knots (or more) that is maintained for at least 1 minute before the speed diminishes is called a

Gust.

Squall.

Wind shift.

Microburst.

A sudden increase in wind speed of at least 16 knots and a sustained average of 22 knots (or more) that lasts for at least 1 minute before the speed diminishes is known as a squall. A squall is a short-lived, intense burst of wind that can be accompanied by heavy rain or snow. It is characterized by a rapid and significant increase in wind speed, often causing hazardous conditions for maritime and aviation activities.

Explanation

A sudden increase in wind speed of at least 16 knots and a sustained average of 22 knots (or more) that lasts for at least 1 minute before the speed diminishes is known as a squall. A squall is a short-lived, intense burst of wind that can be accompanied by heavy rain or snow. It is characterized by a rapid and significant increase in wind speed, often causing hazardous conditions for maritime and aviation activities.

51. Surface pressure changes are largely controlled by

Mass changes in the upper troposphere.

The jetstream pattern in the upper troposphere.

Temperature advection in the middle troposphere.

Positive vorticity advection in the lower troposphere.

The correct answer is mass changes in the upper troposphere. Surface pressure changes are largely controlled by the movement of air masses in the atmosphere. When there are mass changes in the upper troposphere, it can lead to changes in the vertical distribution of air, which in turn affects the surface pressure. These mass changes can be caused by various factors such as the movement of weather systems, the convergence or divergence of air masses, and the vertical motion of air. Therefore, mass changes in the upper troposphere play a significant role in determining surface pressure patterns.

Explanation

The correct answer is mass changes in the upper troposphere. Surface pressure changes are largely controlled by the movement of air masses in the atmosphere. When there are mass changes in the upper troposphere, it can lead to changes in the vertical distribution of air, which in turn affects the surface pressure. These mass changes can be caused by various factors such as the movement of weather systems, the convergence or divergence of air masses, and the vertical motion of air. Therefore, mass changes in the upper troposphere play a significant role in determining surface pressure patterns.

52. What causes the surface low to deepen during the self-development process?

Divergence aloft.

Convergence aloft.

Cold-air advection.

Warm-air advection.

During the self-development process, the surface low deepens due to divergence aloft. Divergence aloft refers to the horizontal movement of air away from a central point in the upper levels of the atmosphere. This movement creates a vertical stretching of the air column, which leads to a decrease in surface pressure. As the surface pressure decreases, the low-pressure system intensifies and deepens. Therefore, divergence aloft is the cause of the surface low deepening during the self-development process.

Explanation

During the self-development process, the surface low deepens due to divergence aloft. Divergence aloft refers to the horizontal movement of air away from a central point in the upper levels of the atmosphere. This movement creates a vertical stretching of the air column, which leads to a decrease in surface pressure. As the surface pressure decreases, the low-pressure system intensifies and deepens. Therefore, divergence aloft is the cause of the surface low deepening during the self-development process.

53. Advection transfers temperature

By electromagnetic waves.

Horizontally by the wind.

Vertically by the wind.

By molecular motion.

Located on page 1-48

Explanation

Located on page 1-48

54. The areas of low pressure that correspond to the belt of low pressure at 60°N created by the 3-cell circulation are the

Icelandic and Asiatic lows.

Icelandic and Aleutian lows.

Aleutian and Asiatic lows.

The Aleutian lows.

Located on page 1-26

Explanation

Located on page 1-26

55. Which heat transfer process involves the transfer of energy by molecular motion from hot to cold objects?

Radiation.

Advection.

Convection.

Conduction.

Located on page 1-48

Explanation

Located on page 1-48

56. The primary cause of surface pressure changes for a dynamic low is net

Divergence aloft.

Adiabatic cooling aloft.

Adiabatic warming aloft.

Divergence at the surface.

Divergence aloft refers to the horizontal movement of air away from a specific location in the upper atmosphere. In the case of a dynamic low, this divergence aloft causes a decrease in air pressure at the surface. As the air moves away from the low-pressure system, it creates a void that is filled by air from higher pressure areas, resulting in a decrease in surface pressure. Therefore, divergence aloft is the primary cause of surface pressure changes in a dynamic low.

Explanation

Divergence aloft refers to the horizontal movement of air away from a specific location in the upper atmosphere. In the case of a dynamic low, this divergence aloft causes a decrease in air pressure at the surface. As the air moves away from the low-pressure system, it creates a void that is filled by air from higher pressure areas, resulting in a decrease in surface pressure. Therefore, divergence aloft is the primary cause of surface pressure changes in a dynamic low.

57. How many stages are there in the life cycle of a low?

Two.

Three.

Four.

Five.

The correct answer is Five. This indicates that there are five stages in the life cycle of a low. However, without further context or information, it is not possible to provide a detailed explanation of what these stages are.

Explanation

The correct answer is Five. This indicates that there are five stages in the life cycle of a low. However, without further context or information, it is not possible to provide a detailed explanation of what these stages are.

58. The average slope of a cold front is

1/30 to 1/100.

1/65 and 1/250.

1/100 and 1/65.

1/250 and 1/50.

The correct answer is 1/30 to 1/100. The average slope of a cold front refers to the rate at which the front rises or falls over a given distance. A slope of 1/30 to 1/100 indicates a gradual incline or decline, suggesting a smooth transition between warm and cold air masses. This range is commonly observed in cold fronts, where the leading edge of a mass of cold air displaces warmer air, causing weather changes.

Explanation

The correct answer is 1/30 to 1/100. The average slope of a cold front refers to the rate at which the front rises or falls over a given distance. A slope of 1/30 to 1/100 indicates a gradual incline or decline, suggesting a smooth transition between warm and cold air masses. This range is commonly observed in cold fronts, where the leading edge of a mass of cold air displaces warmer air, causing weather changes.

59. Which is true of water vapor in the atmosphere?

It absorbs ultraviolet radiation.

The most the air can hold is 6 percent.

The more water vapor, the lighter the air will be.

It keeps the earth from becoming too hot by absorbing solar radiation.

Located on page 1-4

Explanation

Located on page 1-4

60. The width of the jet stream core is approximately equal to the

Width of the 500 millibar isotherm ribbon.

Width of the 500 millibar maximum wind band.

Distance between the -17° Centigrade and the -20° Centigrade isotherms at 500 millibar.

Distance between the -20° Centigrade and the -26° Centigrade isotherms at 500 millibar.

Located on page 1-35

Explanation

Located on page 1-35

61. What will the jet stream usually do when a cold, moving, polar high stagnates and begins to warm?

Move rapidly northward.

Move rapidly southward.

Intensify and move slowly eastward.

Dissipate and a new jet forms to the north.

Located on page 1-40

Explanation

Located on page 1-40

62. Horizontal divergence within an air mass will

Cause the surface pressure to rise.

Increase the mass in the vertical column above the surface.

Increase the vertical extent of the column above the surface.

Vertically contract the original column of air and then expand it horizontally.

Horizontal divergence within an air mass refers to the spreading out of air horizontally. This spreading out causes the air column to vertically contract, meaning it becomes narrower in the vertical direction. As the air column contracts vertically, it then expands horizontally, resulting in a wider area of air. Therefore, the correct answer is that horizontal divergence within an air mass will vertically contract the original column of air and then expand it horizontally.

Explanation

Horizontal divergence within an air mass refers to the spreading out of air horizontally. This spreading out causes the air column to vertically contract, meaning it becomes narrower in the vertical direction. As the air column contracts vertically, it then expands horizontally, resulting in a wider area of air. Therefore, the correct answer is that horizontal divergence within an air mass will vertically contract the original column of air and then expand it horizontally.

63. A low dissipates after proceeding through its entire life cycle which ranges from the

Top down as boundary layer convergence removes mass from the column of air.

Top down as boundary layer divergence removes mass from the column of air.

Bottom up as boundary layer convergence adds mass to the column of air.

Bottom up as boundary layer divergence adds mass to the column of air.

not-available-via-ai

Explanation

not-available-via-ai

64. Frontogenesis requires two adjacent air masses with

The same density and a wind flow separating the two air masses.

Different densities and a wind flow separating the two air masses.

The same density and a wind flow to bring the air masses together.

Different densities and a wind flow to bring the air masses together.

Frontogenesis refers to the process of the formation or strengthening of a front, which is the boundary between two air masses with different properties. In order for frontogenesis to occur, the two air masses must have different densities, as stated in the correct answer. Additionally, a wind flow is necessary to bring these air masses together and create the necessary conditions for frontogenesis. Therefore, the correct answer states that frontogenesis requires different densities and a wind flow to bring the air masses together.

Explanation

Frontogenesis refers to the process of the formation or strengthening of a front, which is the boundary between two air masses with different properties. In order for frontogenesis to occur, the two air masses must have different densities, as stated in the correct answer. Additionally, a wind flow is necessary to bring these air masses together and create the necessary conditions for frontogenesis. Therefore, the correct answer states that frontogenesis requires different densities and a wind flow to bring the air masses together.

65. Which low cloud type and classification is identified by the presence of a cirriform anvil?

Cumulus-L1.

Cumulonimbus-L9.

Cumulonimbus-L3.

Towering cumulus-L2.

The correct answer is Cumulonimbus-L9. The presence of a cirriform anvil is characteristic of a cumulonimbus cloud. Cumulonimbus clouds are large, towering clouds that are associated with thunderstorms and can extend into the upper levels of the atmosphere. The cirriform anvil refers to the flat, spreading top of the cloud that resembles the shape of an anvil. Therefore, Cumulonimbus-L9 is the correct low cloud type and classification that is identified by the presence of a cirriform anvil.

Explanation

The correct answer is Cumulonimbus-L9. The presence of a cirriform anvil is characteristic of a cumulonimbus cloud. Cumulonimbus clouds are large, towering clouds that are associated with thunderstorms and can extend into the upper levels of the atmosphere. The cirriform anvil refers to the flat, spreading top of the cloud that resembles the shape of an anvil. Therefore, Cumulonimbus-L9 is the correct low cloud type and classification that is identified by the presence of a cirriform anvil.

66. Blowing spray is reported only at sea stations near large bodies of water and when visibility at eye level is restricted to

9,000 meters or less.

7,000 meters or less.

6,000 meters or less.

3,200 meters or less.

Blowing spray is reported only at sea stations near large bodies of water and when visibility at eye level is restricted to 9,000 meters or less. This means that blowing spray is observed when the visibility is reduced to 9,000 meters or less. The presence of blowing spray is an indication of rough sea conditions and strong winds, which can create hazardous conditions for maritime activities. Therefore, it is important to report blowing spray when visibility is reduced to 9,000 meters or less.

Explanation

Blowing spray is reported only at sea stations near large bodies of water and when visibility at eye level is restricted to 9,000 meters or less. This means that blowing spray is observed when the visibility is reduced to 9,000 meters or less. The presence of blowing spray is an indication of rough sea conditions and strong winds, which can create hazardous conditions for maritime activities. Therefore, it is important to report blowing spray when visibility is reduced to 9,000 meters or less.

67. Coriolis force is created by

The cyclonic rotation of the earth.

The anticyclonic rotation of the earth.

An opposing force to pressure gradient.

An apparent force and therefore, it does not exist.

Located on page 1-15

Explanation

Located on page 1-15

68. Converging contours downstream of the jet stream will cause the jet to

Decrease in amplitude.

Increase in amplitude.

Deflect towards lower heights.

Deflect towards greater heights.

Located on page 1-37

Explanation

Located on page 1-37

69. Which process is most responsible for the slow formation of air masses in the polar region?

Loss of heat by radiation.

Loss of heat by conduction.

Transport of heat by turbulence.

Transport of heat by evaporation.

Located on page 1-49

Explanation

Located on page 1-49

70. The weather characteristics of a particular month in a given locality are governed by

Wind speed and moisture content.

Effects of local topography and moisture content.

Wind speed and proximity to a zone of divergence.

Effects of local topography and proximity to a zone of convergence.

Located on page 1-62

Explanation

Located on page 1-62

71. After warm air with an unstable wave is pushed aloft and cuts off from a cyclone, the cyclone will become

Baroclinic and begin to deepen.

Barotropic and begin to deepen.

Baroclinic and begin to fill.

Barotropic and begin to fill.

When warm air with an unstable wave is pushed aloft and cuts off from a cyclone, the cyclone will become barotropic and begin to fill. This means that the cyclone will lose its vertical temperature gradient and become more symmetric in terms of temperature distribution. As a result, the cyclone will weaken and fill in, meaning that it will decrease in intensity and fill with cooler air. This is in contrast to a baroclinic cyclone, which would maintain or intensify its temperature gradient and deepen instead of filling.

Explanation

When warm air with an unstable wave is pushed aloft and cuts off from a cyclone, the cyclone will become barotropic and begin to fill. This means that the cyclone will lose its vertical temperature gradient and become more symmetric in terms of temperature distribution. As a result, the cyclone will weaken and fill in, meaning that it will decrease in intensity and fill with cooler air. This is in contrast to a baroclinic cyclone, which would maintain or intensify its temperature gradient and deepen instead of filling.

72. A thunderstorm is present and occurring at your station. In addition, the local noise level is preventing you from hearing the thunderstorm. For observation purposes you would say

Hail is falling.

Heavy rain is falling.

There is lightning within 10 nautical miles.

A cumulonimbus cloud is present overhead.

not-available-via-ai

Explanation

not-available-via-ai

73. The force that is responsible for starting the horizontal movement of air over the earth's surface is

Gravity.

Coriolis.

Centrifugal.

Pressure gradient.

Located on page 1-17

Explanation

Located on page 1-17

74. When using Petterssen's rule, the factors needed for cyclogenesis are upper-level

Convergence and a frontal zone where thermal advection is weak.

Convergence and a frontal zone where thermal advection is strong.

Divergence and a frontal zone where thermal advection is weak.

Divergence and a frontal zone where thermal advection is strong.

Petterssen's rule states that for cyclogenesis, there needs to be divergence and a frontal zone where thermal advection is weak. Divergence refers to the horizontal movement of air away from a given point, which helps create low pressure. A frontal zone is an area where two air masses of different properties meet, often leading to the formation of weather systems. When thermal advection is weak, it means that the horizontal transport of heat is not significant, which allows the frontal zone to remain stable. Therefore, the correct answer is divergence and a frontal zone where thermal advection is weak.

Explanation

Petterssen's rule states that for cyclogenesis, there needs to be divergence and a frontal zone where thermal advection is weak. Divergence refers to the horizontal movement of air away from a given point, which helps create low pressure. A frontal zone is an area where two air masses of different properties meet, often leading to the formation of weather systems. When thermal advection is weak, it means that the horizontal transport of heat is not significant, which allows the frontal zone to remain stable. Therefore, the correct answer is divergence and a frontal zone where thermal advection is weak.

75. When only high and middle clouds are associated with a warm front, the

Underlying cold air is dry.

Underlying cold air is moist.

Overrunning warm air is dry.

Overrunning warm air is moist.

When only high and middle clouds are associated with a warm front, it indicates that the underlying cold air is dry. This is because high and middle clouds are composed of ice crystals and supercooled water droplets, which form in cold air. If the underlying cold air were moist, it would result in the formation of low-level clouds as well. However, since only high and middle clouds are present, it suggests that the overrunning warm air is dry.

Explanation

When only high and middle clouds are associated with a warm front, it indicates that the underlying cold air is dry. This is because high and middle clouds are composed of ice crystals and supercooled water droplets, which form in cold air. If the underlying cold air were moist, it would result in the formation of low-level clouds as well. However, since only high and middle clouds are present, it suggests that the overrunning warm air is dry.

76. The frontolytic processes are most effective

On the east coast of continents.

On the west coast of continents.

In the lower layers of the atmosphere.

In the upper layers of the atmosphere.

Frontolytic processes refer to the mechanisms that weaken or dissipate fronts, which are boundaries between air masses with different characteristics. These processes are most effective in the lower layers of the atmosphere because this is where the majority of the atmospheric mixing and turbulence occur. In the lower layers, warm air rises and cold air sinks, creating instability and enhancing the interaction between air masses. This promotes the disruption of fronts and the dispersion of their associated weather systems. In contrast, the upper layers of the atmosphere are generally more stable and have less mixing, making frontolysis less effective.

Explanation

Frontolytic processes refer to the mechanisms that weaken or dissipate fronts, which are boundaries between air masses with different characteristics. These processes are most effective in the lower layers of the atmosphere because this is where the majority of the atmospheric mixing and turbulence occur. In the lower layers, warm air rises and cold air sinks, creating instability and enhancing the interaction between air masses. This promotes the disruption of fronts and the dispersion of their associated weather systems. In contrast, the upper layers of the atmosphere are generally more stable and have less mixing, making frontolysis less effective.

77. The stratosphere is characterized by

Noctilucent clouds, a "D" layer, and excellent flying conditions.

A constantly warming temperature, mother-of-pearl clouds, and generally poor flying weather.

A maximum temperature of 7°C, the strongest concentration of ozone, dense cirrus clouds, and occasionally poor flying conditions.

A temperature that remains isothermal to about 100,000 feet, the strongest concentration of ozone, and excellent flying conditions.

Located on page 1-3

Explanation

Located on page 1-3

78. The two atmospheric gases most responsible for the absorption of incoming solar radiation are

Oxygen and ozone

Ozone and water vapor

Oxygen and water vapor

Ozone and carbon dioxide

Located on page 1-9

Explanation

Located on page 1-9

79. Aloft, during the baroclinic instability process, the thermal wave and contour wave are

In phase and cold-air advection occurs into the contour trough.

In phase and warm-air advection occurs into the contour trough

Out-of-phase and warm-air advection occurs into the contour trough

Out-of-phase and cold-air advection occurs into the contour trough

During the baroclinic instability process, the thermal wave and contour wave are out-of-phase, meaning that they are not synchronized in their oscillations. This means that when the thermal wave is at its peak, the contour wave is at its trough, and vice versa. Additionally, cold-air advection occurs into the contour trough, which means that colder air is moving into the region of lower pressure.

Explanation

During the baroclinic instability process, the thermal wave and contour wave are out-of-phase, meaning that they are not synchronized in their oscillations. This means that when the thermal wave is at its peak, the contour wave is at its trough, and vice versa. Additionally, cold-air advection occurs into the contour trough, which means that colder air is moving into the region of lower pressure.

80. Which is primarily responsible for low-level divergence acting as a braking mechanism for a high?

Friction.

Coriolis force.

Centrifugal force.

Pressure gradient force.

Friction is primarily responsible for low-level divergence acting as a braking mechanism for a high. Friction occurs when two surfaces come into contact and resist each other's motion. In the context of weather systems, when a high-pressure system moves over a surface with lower pressure, the air tends to flow from the high-pressure area to the low-pressure area. However, friction between the air and the surface slows down this movement, causing divergence or spreading out of the air. This divergence acts as a braking mechanism for the high-pressure system, preventing it from intensifying further.

Explanation

Friction is primarily responsible for low-level divergence acting as a braking mechanism for a high. Friction occurs when two surfaces come into contact and resist each other's motion. In the context of weather systems, when a high-pressure system moves over a surface with lower pressure, the air tends to flow from the high-pressure area to the low-pressure area. However, friction between the air and the surface slows down this movement, causing divergence or spreading out of the air. This divergence acts as a braking mechanism for the high-pressure system, preventing it from intensifying further.

81. The best sources for identifying a frontal inversion are the

Temperature and dew-point curves.

Dew-point curve and the vertical wind distribution.

Temperature and dew-point curves and the vertical wind distribution.

Temperature and dew-point curves and the horizontal wind distribution.

The best sources for identifying a frontal inversion are the temperature and dew-point curves and the vertical wind distribution. A frontal inversion occurs when warm air is trapped beneath a layer of cooler air, causing a temperature inversion. By analyzing the temperature and dew-point curves, one can identify the presence of a frontal inversion. Additionally, the vertical wind distribution can provide further evidence of a frontal inversion, as it may show a stable layer of air preventing vertical mixing. Therefore, both the temperature and dew-point curves and the vertical wind distribution are crucial in identifying a frontal inversion.

Explanation

The best sources for identifying a frontal inversion are the temperature and dew-point curves and the vertical wind distribution. A frontal inversion occurs when warm air is trapped beneath a layer of cooler air, causing a temperature inversion. By analyzing the temperature and dew-point curves, one can identify the presence of a frontal inversion. Additionally, the vertical wind distribution can provide further evidence of a frontal inversion, as it may show a stable layer of air preventing vertical mixing. Therefore, both the temperature and dew-point curves and the vertical wind distribution are crucial in identifying a frontal inversion.

82. As air converges at the surface and toward the center of a layer, there will be horizontal

And vertical expansion.

Contraction and vertical expansion.

Expansion and vertical contraction.

Contraction and vertical contraction.

When air converges at the surface and toward the center of a layer, it experiences a decrease in horizontal area, leading to contraction. At the same time, there is an upward movement of air due to this convergence, causing vertical expansion. Therefore, the correct answer is "contraction and vertical expansion."

Explanation

When air converges at the surface and toward the center of a layer, it experiences a decrease in horizontal area, leading to contraction. At the same time, there is an upward movement of air due to this convergence, causing vertical expansion. Therefore, the correct answer is "contraction and vertical expansion."

83. A warm barotropic high is a type of pressure system that

Has great vertical extent and its axis tilts with height.

Has great vertical extent and is usually found over water areas.

Rarely exceeds 8,000 feet vertically and its axis tilts with height.

Rarely exceeds 8,000 feet vertically and is found over water areas.

A warm barotropic high is a type of pressure system that has great vertical extent, meaning it extends over a large range of altitudes. It is usually found over water areas, which suggests that it forms over bodies of water rather than over land. This could be due to the fact that water has a higher heat capacity than land, allowing for the formation of a more extensive and stable high pressure system.

Explanation

A warm barotropic high is a type of pressure system that has great vertical extent, meaning it extends over a large range of altitudes. It is usually found over water areas, which suggests that it forms over bodies of water rather than over land. This could be due to the fact that water has a higher heat capacity than land, allowing for the formation of a more extensive and stable high pressure system.

84. Pilot reported ceiling heights must be converted from height above

Ground level to sea level.

Mean sea level to ground level.

Mean sea level to height above ground level.

Ground level to height above mean sea level.

The pilot needs to convert the ceiling heights from mean sea level to height above ground level. This means that the reported heights need to be adjusted to reflect the distance above the ground rather than the distance above mean sea level. This is important for accurate navigation and communication with air traffic control, as the pilot needs to know the height of obstacles and terrain relative to their current altitude above the ground.

Explanation

The pilot needs to convert the ceiling heights from mean sea level to height above ground level. This means that the reported heights need to be adjusted to reflect the distance above the ground rather than the distance above mean sea level. This is important for accurate navigation and communication with air traffic control, as the pilot needs to know the height of obstacles and terrain relative to their current altitude above the ground.

85. You are preparing to use a convective cloud height table to determine the heights of clouds. To do this properly, you must first determine the

Wet-bulb temperature and free-air temperature.

Dew-point temperature and free-air temperature.

Wet-bulb temperature and dew-point temperature.

Dew-point temperature and dry-bulb temperature.

To properly determine the heights of clouds using a convective cloud height table, it is necessary to know the dew-point temperature and free-air temperature. The dew-point temperature is the temperature at which air becomes saturated and condensation begins. It is a measure of the amount of moisture in the air. The free-air temperature, on the other hand, is the temperature of the surrounding air. By knowing these two temperatures, one can accurately determine the height of clouds using the convective cloud height table.

Explanation

To properly determine the heights of clouds using a convective cloud height table, it is necessary to know the dew-point temperature and free-air temperature. The dew-point temperature is the temperature at which air becomes saturated and condensation begins. It is a measure of the amount of moisture in the air. The free-air temperature, on the other hand, is the temperature of the surrounding air. By knowing these two temperatures, one can accurately determine the height of clouds using the convective cloud height table.

86. The temperature an air parcel would have if it were cooled adiabatically to saturation at constant pressure by evaporation of water into it is called

Dew point.

Relative humidity.

Dry bulb temperature.

Wet bulb temperature.

The wet bulb temperature refers to the temperature that an air parcel would have if it were cooled adiabatically to saturation at constant pressure by evaporation of water into it. This is different from the dry bulb temperature, which is the temperature of the air measured with a regular thermometer. The wet bulb temperature takes into account the cooling effect of evaporation and is often used to determine the level of humidity in the air.

Explanation

The wet bulb temperature refers to the temperature that an air parcel would have if it were cooled adiabatically to saturation at constant pressure by evaporation of water into it. This is different from the dry bulb temperature, which is the temperature of the air measured with a regular thermometer. The wet bulb temperature takes into account the cooling effect of evaporation and is often used to determine the level of humidity in the air.

87. A stable air mass that formed over land in the Arctic has now moved over the ocean's warmer surface. You would classify this air mass as

MAws.

MAks.

CAwu.

CAks.

Located on page 1-51

Explanation

Located on page 1-51

88. Which region of the United States favors the development of frontal occlusions?

East.

West.

North.

South.

The correct answer is North. The region of the United States that favors the development of frontal occlusions is the North. This is because frontal occlusions occur when a warm air mass collides with a cold air mass, and the North region of the United States experiences more frequent clashes between warm and cold air masses due to its geographical location. These clashes lead to the formation of frontal occlusions, which can result in various weather phenomena such as rain, snow, and storms.

Explanation

The correct answer is North. The region of the United States that favors the development of frontal occlusions is the North. This is because frontal occlusions occur when a warm air mass collides with a cold air mass, and the North region of the United States experiences more frequent clashes between warm and cold air masses due to its geographical location. These clashes lead to the formation of frontal occlusions, which can result in various weather phenomena such as rain, snow, and storms.

89. Explain why the sky is blue.

Short-wave radiation is reflected by atmospheric particles larger than .5 microns.

Short-wave radiation is reflected by atmospheric particles smaller than .5 microns.

Long-wave radiation is reflected by atmospheric particles larger than .5 microns.

Long-wave radiation is reflected by atmospheric particles smaller than .5 microns.

Located on page 1-9

Explanation

Located on page 1-9

90. A cyclone that develops on a polar front, does not intensify significantly, and never occludes is called

Polar.

Stable.

Unstable.

Tropical.

A cyclone that develops on a polar front refers to a low-pressure system that forms along the boundary between polar air and warmer air. If this cyclone does not intensify significantly, it means that it does not strengthen or grow in size. Additionally, if it never occludes, it means that the warm and cold fronts associated with the cyclone do not merge and cut off the warm sector. Therefore, this type of cyclone can be described as stable, as it remains relatively weak and does not undergo significant changes or occlusion.

Explanation

A cyclone that develops on a polar front refers to a low-pressure system that forms along the boundary between polar air and warmer air. If this cyclone does not intensify significantly, it means that it does not strengthen or grow in size. Additionally, if it never occludes, it means that the warm and cold fronts associated with the cyclone do not merge and cut off the warm sector. Therefore, this type of cyclone can be described as stable, as it remains relatively weak and does not undergo significant changes or occlusion.

91. The designated runway visual range (RVR) runway is

Any instrumented runway.

The current active runway.

Any runway that has been instrumented with a transmissometer.

Any runway that has all the meteorological instruments located alongside it.

The designated runway visual range (RVR) runway refers to any runway that has been instrumented with a transmissometer. A transmissometer is a device that measures the visibility on the runway by transmitting a light beam and measuring the amount of light that is able to pass through the atmosphere. By instrumenting the runway with a transmissometer, the RVR can be accurately determined, which is crucial information for pilots during takeoff, landing, and taxiing operations. Therefore, the correct answer is any runway that has been instrumented with a transmissometer.

Explanation

The designated runway visual range (RVR) runway refers to any runway that has been instrumented with a transmissometer. A transmissometer is a device that measures the visibility on the runway by transmitting a light beam and measuring the amount of light that is able to pass through the atmosphere. By instrumenting the runway with a transmissometer, the RVR can be accurately determined, which is crucial information for pilots during takeoff, landing, and taxiing operations. Therefore, the correct answer is any runway that has been instrumented with a transmissometer.

92. Which heat transfer process vertically transports the atmospheric properties of heat and moisture and is a more efficient method of heat transfer than by molecular motion?

Radiation.

Advection.

Convection.

Conduction.

Located on page 1-48

Explanation

Located on page 1-48

93. Which factors act as air mass modifiers?

Radiation loss, thermodynamics, advection, and mechanical mixing.

Surface pressure, surface temperature, clouds, and precipitation.

Altitude, ocean currents, vegetation, and thermodynamics.

Topography, radiation loss, and mean circulation.

Located on page 1-54

Explanation

Located on page 1-54

94. Using average surface frontal slopes, how far behind of the surface cold front is the jet stream located?

300 miles

400 miles

500 miles

600 miles

Located on page 1-39

Explanation

Located on page 1-39

95. Using average surface frontal slopes, how far ahead of the surface warm front is the jet stream located?

300 miles

400 miles

500 miles

600 miles

Located on page 1-39

Explanation

Located on page 1-39

96. Air mass stability characteristics often depend on the temperature difference between the

Air mass and the source region surface.

Upper- and lower-level air, and source region.

Air mass and the surface over which it is traveling.

Air-mass source region surface and the surface over which the air mass is traveling.

Located on page 1-51

Explanation

Located on page 1-51

97. What is the reference level for all pressure values?

Station pressure.

Altimeter setting.

Sea-level pressure.

Corrected aneroid reading.

Sea-level pressure is the reference level for all pressure values. It is the atmospheric pressure at sea level, adjusted to the mean sea level. This reference level is used to compare and standardize pressure measurements taken at different altitudes. Station pressure refers to the atmospheric pressure at a specific location, altimeter setting is the atmospheric pressure adjusted for the altitude of an aircraft, and corrected aneroid reading is a term not commonly used in reference to pressure. Therefore, sea-level pressure is the correct answer as it provides a consistent baseline for pressure measurements.

Explanation

Sea-level pressure is the reference level for all pressure values. It is the atmospheric pressure at sea level, adjusted to the mean sea level. This reference level is used to compare and standardize pressure measurements taken at different altitudes. Station pressure refers to the atmospheric pressure at a specific location, altimeter setting is the atmospheric pressure adjusted for the altitude of an aircraft, and corrected aneroid reading is a term not commonly used in reference to pressure. Therefore, sea-level pressure is the correct answer as it provides a consistent baseline for pressure measurements.

98. Which air mass involves most of the wintertime storms for the North American Pacific coast?

MP

CP

MT

CT

Located on page 1-59

Explanation

Located on page 1-59

99. The atmosphere properties that can be a measure of the strength of a frontal system are thickness gradient,

Temperature gradient, lapse rate, turbulence, and wind shear.

Dew point gradient, lapse rate, wind direction, and wind speed.

Temperature gradient, dew point gradient, and turbulence.

Temperature gradient, wind grad.

The correct answer is temperature gradient, lapse rate, turbulence, and wind shear. These atmospheric properties can be used to measure the strength of a frontal system. Temperature gradient refers to the change in temperature over a given distance, which can indicate the intensity of the front. Lapse rate is the rate at which temperature changes with altitude, and a steep lapse rate can indicate a strong front. Turbulence is the chaotic movement of air, which can be heightened in the presence of a front. Wind shear refers to the change in wind speed or direction over a short distance, and strong wind shear can indicate a powerful front.

Explanation

The correct answer is temperature gradient, lapse rate, turbulence, and wind shear. These atmospheric properties can be used to measure the strength of a frontal system. Temperature gradient refers to the change in temperature over a given distance, which can indicate the intensity of the front. Lapse rate is the rate at which temperature changes with altitude, and a steep lapse rate can indicate a strong front. Turbulence is the chaotic movement of air, which can be heightened in the presence of a front. Wind shear refers to the change in wind speed or direction over a short distance, and strong wind shear can indicate a powerful front.

100. The cold conveyor belt originates in the low levels that are located

West of a low center and flow westward.

East of a low center and flow westward.

West of a low center and flow eastward.

East of a low center and flow eastward.

The cold conveyor belt originates east of a low center and flows westward. This is because in a low-pressure system, air circulates counterclockwise. The cold conveyor belt is part of this counterclockwise circulation and is located to the east of the low center. It brings cold air from higher latitudes and transports it towards the west, contributing to the formation of clouds and precipitation on the eastern side of the low-pressure system.

Explanation

The cold conveyor belt originates east of a low center and flows westward. This is because in a low-pressure system, air circulates counterclockwise. The cold conveyor belt is part of this counterclockwise circulation and is located to the east of the low center. It brings cold air from higher latitudes and transports it towards the west, contributing to the formation of clouds and precipitation on the eastern side of the low-pressure system.

101. A warm frontal occlusion occurs when the cool air

Ahead of the cold front lifts the cooler air ahead of the warm front.

Behind the cold front lifts the cooler air ahead of the warm front.

Behind the cold front overrides the colder air ahead of the warm front.

Ahead of the warm front overrides the colder air behind the cold front.

not-available-via-ai

Explanation

not-available-via-ai

102. For a runway visual range (RVR) report of R22/1000V1600FT, what is the visual range that a pilot can expect to see down the runway?

1,500 feet.

1,600 feet.

1,500 meters.

1,600 meters.

The RVR report of R22/1000V1600FT indicates that the runway visual range is 1,600 meters. The "R22" indicates that the visual range is 1,600 meters, and the "1000V1600FT" indicates that the visual range can vary between 1,000 feet and 1,600 feet. Therefore, the pilot can expect to see a visual range of 1,600 meters down the runway.

Explanation

The RVR report of R22/1000V1600FT indicates that the runway visual range is 1,600 meters. The "R22" indicates that the visual range is 1,600 meters, and the "1000V1600FT" indicates that the visual range can vary between 1,000 feet and 1,600 feet. Therefore, the pilot can expect to see a visual range of 1,600 meters down the runway.

103. What pressure value is the basis for determining all other pressure values?

Station pressure.

Altimeter setting.

Sea-level pressure.

Corrected aneroid reading.

Station pressure is the basis for determining all other pressure values because it represents the actual atmospheric pressure at a specific location. Altimeter setting is a corrected value of station pressure, sea-level pressure is the station pressure adjusted to sea-level, and corrected aneroid reading is a measurement taken by an aneroid barometer that has been calibrated to account for errors. Therefore, station pressure is the most fundamental and accurate measurement of pressure.

Explanation

Station pressure is the basis for determining all other pressure values because it represents the actual atmospheric pressure at a specific location. Altimeter setting is a corrected value of station pressure, sea-level pressure is the station pressure adjusted to sea-level, and corrected aneroid reading is a measurement taken by an aneroid barometer that has been calibrated to account for errors. Therefore, station pressure is the most fundamental and accurate measurement of pressure.

104. An intense cyclogenesis normally occurs in troughs with a

Negative tilt that is oriented northeast/southwest

Negative tilt that is oriented northwest/southeast

Positive tilt that is oriented northeast/southwest

Positive tilt that is oriented northwest/southeast

An intense cyclogenesis refers to the rapid development of a cyclone or low-pressure system. In this case, the correct answer suggests that intense cyclogenesis occurs in troughs with a negative tilt that is oriented northwest/southeast. A negative tilt means that the trough is tilted from southwest to northeast, which allows for the convergence of warm and cold air masses. This convergence leads to the formation of a strong low-pressure system and the intensification of the cyclone. The northwest/southeast orientation indicates the direction of the tilt, which further enhances the conditions for cyclogenesis.

Explanation

An intense cyclogenesis refers to the rapid development of a cyclone or low-pressure system. In this case, the correct answer suggests that intense cyclogenesis occurs in troughs with a negative tilt that is oriented northwest/southeast. A negative tilt means that the trough is tilted from southwest to northeast, which allows for the convergence of warm and cold air masses. This convergence leads to the formation of a strong low-pressure system and the intensification of the cyclone. The northwest/southeast orientation indicates the direction of the tilt, which further enhances the conditions for cyclogenesis.

105. In relation to the jet core, the greatest horizontal wind shear is usually located

Above the jet core.

North of the jet core.

South of the jet core.

At the jet core's narrowest horizontal point

Located on page 1-32

Explanation

Located on page 1-32

106. You would classify precipitation as intermittent if it

Stopped and started at least once within the preceding hour.

Stopped and started at least twice within the preceding hour.

Stopped and started at least once within the preceding 15 minutes.

Occurred any time in the preceding hour but not at the time of observation.

Intermittent precipitation refers to precipitation that stops and starts at least once within the preceding hour. This means that there is a break in the precipitation, followed by a resumption of precipitation within the hour. This classification is based on the frequency of the start and stop of precipitation within a specific time frame.

Explanation

Intermittent precipitation refers to precipitation that stops and starts at least once within the preceding hour. This means that there is a break in the precipitation, followed by a resumption of precipitation within the hour. This classification is based on the frequency of the start and stop of precipitation within a specific time frame.

107. The earth's atmosphere receives the most heating through the process of

Direct solar radiation

Atmospheric scattering

Reradiated energy from the earth's surface

Reradiated energy from clouds and other atmospheric components

Located on page 1-5

Explanation

Located on page 1-5

108. With an inactive cold front, the net flow is

Upward.

Downward.

Upward in the upper portion of the front and downward in the lower portion.

Downward in the upper portion of the front and upward in the lower portion.

An inactive cold front refers to a situation where the cold air mass is not advancing towards the warm air mass. In this case, there is no significant vertical motion or uplift of air along the front. Therefore, the net flow of air is generally upward, as there is no downward motion or sinking of air.

Explanation

An inactive cold front refers to a situation where the cold air mass is not advancing towards the warm air mass. In this case, there is no significant vertical motion or uplift of air along the front. Therefore, the net flow of air is generally upward, as there is no downward motion or sinking of air.

109. Which high cloud can occasionally be so transparent that the only indication of its presence is a halo phenomenon?

H1.

H4.

H7.

H8.

High cloud H7, also known as cirrostratus clouds, can occasionally be so transparent that the only indication of its presence is a halo phenomenon. Cirrostratus clouds are thin and wispy clouds that form at high altitudes, usually above 20,000 feet. They are composed of ice crystals and can create a halo effect around the sun or moon due to the refraction and reflection of light. This halo phenomenon is a result of the cloud's transparency and the interaction of light with the ice crystals in the cloud.

Explanation

High cloud H7, also known as cirrostratus clouds, can occasionally be so transparent that the only indication of its presence is a halo phenomenon. Cirrostratus clouds are thin and wispy clouds that form at high altitudes, usually above 20,000 feet. They are composed of ice crystals and can create a halo effect around the sun or moon due to the refraction and reflection of light. This halo phenomenon is a result of the cloud's transparency and the interaction of light with the ice crystals in the cloud.

110. What causes the subtropical jet (STJ) to recurve?

A decrease in the horizontal temperature contrast.

The jet axis entering into a subgradient wind field.

The conservation of angular momentum.

Coriolis force.

Located on page 1-35

Explanation

Located on page 1-35

111. The rate that an air mass modifies depends on the

Temperature differences between the new surface and the air mass, and the speed with which the air mass travels.

Located on page 1-61

Explanation

Located on page 1-61

112. In comparison to an active cold front, an inactive cold front is characterized by a relatively

Steeper slope, a wide weather pattern, and is called anafront.

Shallower slope, a wide weather pattern, and is called anafront.

Steeper slope, a narrow weather pattern, and is called katafront.

Shallower slope, a narrow weather pattern, and is called katafront.

An inactive cold front is characterized by a steeper slope, a narrow weather pattern, and is called a katafront. This means that the boundary between the cold air mass and the warm air mass is more pronounced and has a sharper angle. The weather associated with an inactive cold front is generally less active and may not produce as much precipitation as an active cold front. The narrow weather pattern indicates that the front is more focused and concentrated, affecting a smaller area. The term "katafront" is used to describe this type of front.

Explanation

An inactive cold front is characterized by a steeper slope, a narrow weather pattern, and is called a katafront. This means that the boundary between the cold air mass and the warm air mass is more pronounced and has a sharper angle. The weather associated with an inactive cold front is generally less active and may not produce as much precipitation as an active cold front. The narrow weather pattern indicates that the front is more focused and concentrated, affecting a smaller area. The term "katafront" is used to describe this type of front.

113. Low cloud bases range from

The surface to 6,500 feet mean sea level.

The surface to 6,500 feet above ground level.

Near the surface to 6,500 feet mean sea level.

Near the surface to 6,500 feet above ground level.

Low cloud bases refer to the height at which clouds are formed and are typically measured from the surface of the Earth. In this case, the correct answer states that low cloud bases range from near the surface to 6,500 feet above ground level. This means that the clouds are formed relatively close to the ground and can extend up to a height of 6,500 feet above the ground.

Explanation

Low cloud bases refer to the height at which clouds are formed and are typically measured from the surface of the Earth. In this case, the correct answer states that low cloud bases range from near the surface to 6,500 feet above ground level. This means that the clouds are formed relatively close to the ground and can extend up to a height of 6,500 feet above the ground.

114. The primary difference between stratus and altostratus clouds is

The composition of the clouds.

Precipitation.

Movement.

Color.

The primary difference between stratus and altostratus clouds is the composition of the clouds. Stratus clouds are low-level clouds that are uniform and layered, often covering the entire sky. They are composed of water droplets and sometimes ice crystals. On the other hand, altostratus clouds are mid-level clouds that are also layered but usually thicker and darker than stratus clouds. They are composed of both water droplets and ice crystals, and often indicate the approach of a warm front or a storm system. Therefore, the composition of the clouds is what sets stratus and altostratus clouds apart from each other.

Explanation

The primary difference between stratus and altostratus clouds is the composition of the clouds. Stratus clouds are low-level clouds that are uniform and layered, often covering the entire sky. They are composed of water droplets and sometimes ice crystals. On the other hand, altostratus clouds are mid-level clouds that are also layered but usually thicker and darker than stratus clouds. They are composed of both water droplets and ice crystals, and often indicate the approach of a warm front or a storm system. Therefore, the composition of the clouds is what sets stratus and altostratus clouds apart from each other.

115. Cirrus clouds in the form of an anvil are classified as

H4.

H3.

H2.

H1.

Cirrus clouds in the form of an anvil are classified as H3. This classification is based on the shape and appearance of the cloud. An anvil-shaped cirrus cloud typically indicates the presence of a strong thunderstorm or severe weather conditions. The H3 classification helps meteorologists identify and categorize different types of clouds based on their characteristics.

Explanation

Cirrus clouds in the form of an anvil are classified as H3. This classification is based on the shape and appearance of the cloud. An anvil-shaped cirrus cloud typically indicates the presence of a strong thunderstorm or severe weather conditions. The H3 classification helps meteorologists identify and categorize different types of clouds based on their characteristics.

116. A corona is often present at night with

Stratus clouds.

Altostratus clouds.

Altocumulus clouds.

Stratocumulus clouds.

Altocumulus clouds often form a corona at night. A corona is a ring of light that surrounds the sun or the moon and is caused by the diffraction, or bending, of light around water droplets or ice crystals in the atmosphere. Altocumulus clouds are mid-level clouds that consist of water droplets and are often associated with fair weather. Their presence at night can create the conditions necessary for a corona to form, making them the correct answer.

Explanation

Altocumulus clouds often form a corona at night. A corona is a ring of light that surrounds the sun or the moon and is caused by the diffraction, or bending, of light around water droplets or ice crystals in the atmosphere. Altocumulus clouds are mid-level clouds that consist of water droplets and are often associated with fair weather. Their presence at night can create the conditions necessary for a corona to form, making them the correct answer.

117. You are evaluating a jet maximum in straight line flow. To do this properly, you would locate the maximum area of convergence at the

Left rear quadrant

Left front quadrant

Right rear quadrant

Right front quadrant

In order to evaluate a jet maximum in straight line flow, it is important to locate the maximum area of convergence. The left rear quadrant is the correct answer because it is the area where the flow is converging the most. This means that the velocity of the fluid is increasing in this region, indicating the presence of a jet maximum. The left front, right rear, and right front quadrants do not experience as much convergence, so they are not the correct locations for the maximum area of convergence.

Explanation

In order to evaluate a jet maximum in straight line flow, it is important to locate the maximum area of convergence. The left rear quadrant is the correct answer because it is the area where the flow is converging the most. This means that the velocity of the fluid is increasing in this region, indicating the presence of a jet maximum. The left front, right rear, and right front quadrants do not experience as much convergence, so they are not the correct locations for the maximum area of convergence.

118. Wein's law states that

The wave length at which maximum energy is emitted is directly prportional to the object's temperature.

The wave length at which maximum energy is emitted is inversely proportional to the object's temperature.

An object's temperature is directly proportional to its maximum absorption wavelength.

An object's temperature is inversely proportional to its maximum absorption wavelength.

located on page 1-45

Explanation

located on page 1-45

119. To achieve geostrophic windflow, there must be a balance between

Pressure gradient force and centrifugal force.

Pressure gradient force and coriolis force.

Coriolis force and centrifugal force.

Coriolis force and friction.

Located on page 1-18

Explanation

Located on page 1-18

120. The balance of forces needed for gradient cyclonic circulation is pressure gradient

Balanced against friction and coriolis forces.

And friction balanced against centrifugal forces.

Balanced against coriolis and centrifugal forces.

And centrifugal balanced against coriolis forces.

Located on page of 1-21

Explanation

Located on page of 1-21

121. In the baroclinic instability process,

Kinetic energy is transferred to the major short wave by thermal advection.

Potential energy is transferred to the major short wave by thermal advection.

Kinetic energy is transferred to the major short wave by low-level circulations.

Potential energy is transferred to the major short wave by low-level circulations.

In the baroclinic instability process, potential energy is transferred to the major short wave by thermal advection. This means that the transfer of potential energy to the short wave is facilitated by the movement of heat through the atmosphere. As the warm and cold air masses interact, the potential energy in the system is converted into kinetic energy, leading to the formation of the major short wave. The thermal advection plays a crucial role in this energy transfer process.

Explanation

In the baroclinic instability process, potential energy is transferred to the major short wave by thermal advection. This means that the transfer of potential energy to the short wave is facilitated by the movement of heat through the atmosphere. As the warm and cold air masses interact, the potential energy in the system is converted into kinetic energy, leading to the formation of the major short wave. The thermal advection plays a crucial role in this energy transfer process.

122. How would you classify middle clouds that can lower to within several hundred feet of the surface?

M1.

M2.

M4.

M7.

Middle clouds that can lower to within several hundred feet of the surface are classified as M2.

Explanation

Middle clouds that can lower to within several hundred feet of the surface are classified as M2.

123. In the summer, the continental highs

Intensify over the heated land and the cP source regions move farther south.

Intensify over the heated land and the cP source regions move farther north.

Dissipate over the heated land and the cP source regions move farther south.

Dissipate over the heated land and the cP source regions move farther north.

Located on page 1-61

Explanation

Located on page 1-61

124. The balance of forces needed for gradient anticyclonic circulation are presure gradient

Balances against friction and coriolis forces

And friction balances against centrifugal forces.

Balances against coriolis and centrifugal forces.

And centrifugal balances against coriolis force.

Located on page 1-20

Explanation

Located on page 1-20

1w051a CDC Volume 1

1. What air mass forms over land only during the summer?

2.

What first name or nickname would you like us to use?

2. A decrease of mass in a column of air will cause the surface pressure to

3. Which orographic cloud resembles an almond or a fish?

4. "Clouds or obscuring phenomena that have bases at the same approximate level" is the definition of

5. How do you report prevailing visibility at US stations and overseas stations?

6. To properly report the visibility for more than one sector, you would list the sectors in a

7. What is the intensity of snow which restricts visibility to less than 1/4 mile?

8. "Jet fingers"

9. An increase of mass in a column of air will cause the surface pressure to

10. When the central pressure of an anticyclone is rising, you can infer the anticyclone is

11. Unstable waves are classified as

12. In the life cycle of a low, the wave will reach its maximum intensity in the

13. What causes a surface high to build during the self-development process?

14. The best way to distinguish stratocumulus from altocumulus clouds is to use

15. The distinguishing feature of any tornadic activity is

16. Above 13 miles, the radiation from the sun breaks down the oxygen in the atmosphere into

17. A high-pressure system undergoes anticyclolysis when the clockwise circulation area

18. A thunderstorm officially ends

19. The three circulation cells in the three-cell circulation theory are

20. If you throw a ball towards a stationary target from the window of a speeding vehicle, coriolis force will cause the ball to miss the target

21. The simplest method for locating the 500 millibar frontal zone is to

22. What air mass calssification signifies an unstable, maritime tropical air mass that is colder than the surface it is moving over?

23. What air mass classification signifies a stable, continental polar air mass that is warmer than the surface it is moving over?

24. It is winter. A cPk air mass is moving over the great lakes. In this situation, the southern shores of the Great Lakes will experience

25. Continental tropical air masses are usually associated with

26. The damper effect is comprised of upper-level

27. A low-pressure system undergoing cyclogenesis is said to be

28. In a warm frontal occlusion, the coldest air is found

29. Which high cloud classification is also referred to as a mackerel sky?

30. What type of precipitation might you observe with clear skies?

31. Precipitation is reported to the nearest

32. Centrifugal force will increase when there is a decrease in

33. When an inactive front passes your station, the dew points will

34. For observing purposes, five hydrometers are considered to be obstructions to vision. They include mist, fog, blowing snow,

35. How many degrees centigrade does the temperature decrease per 1,000 meters of altitude in the troposphere?

36. The driving mechanism that is mainly responsible for the earth's large-scale atmospheric circulations is the

37. In relation to the jet core, the greatest vertical wind shear is usually located

38. What factors must a region possess in order to facilitate air mass formation?

39. With the passage of a cold front in the Northern Hemisphere, the horizontal wind direction will

40. In a cold occlusion, the coldest air is found

41. The most desirable night-visibility markers are

42. The three main forms of precipitation are liquid,

43. Which type of obstruction to vision is classified as a lithometer?

44. Which is a calculated sea-level pressure in inches of mercury?

45. Wind observing equipment is oriented to

46. Which force is the "equal and opposite reaction" to the center-seeking force?

47. The jet core that is located between the midlatitude and the tropical tropoause's is called the

48. Anticyclogenesis typically occurs at, and just downstream from, long-wave

49. What color balloon would you use to determine the ceiling heights of thin clouds?

50. A sudden increase of wind speed of at least 16 knots and a sustained average of 22 knots (or more) that is maintained for at least 1 minute before the speed diminishes is called a

51. Surface pressure changes are largely controlled by

52. What causes the surface low to deepen during the self-development process?

53. Advection transfers temperature

54. The areas of low pressure that correspond to the belt of low pressure at 60°N created by the 3-cell circulation are the

55. Which heat transfer process involves the transfer of energy by molecular motion from hot to cold objects?

56. The primary cause of surface pressure changes for a dynamic low is net

57. How many stages are there in the life cycle of a low?

58. The average slope of a cold front is

59. Which is true of water vapor in the atmosphere?

60. The width of the jet stream core is approximately equal to the

61. What will the jet stream usually do when a cold, moving, polar high stagnates and begins to warm?

62. Horizontal divergence within an air mass will

63. A low dissipates after proceeding through its entire life cycle which ranges from the

64. Frontogenesis requires two adjacent air masses with

65. Which low cloud type and classification is identified by the presence of a cirriform anvil?

66. Blowing spray is reported only at sea stations near large bodies of water and when visibility at eye level is restricted to

67. Coriolis force is created by

68. Converging contours downstream of the jet stream will cause the jet to

69. Which process is most responsible for the slow formation of air masses in the polar region?

70. The weather characteristics of a particular month in a given locality are governed by

71. After warm air with an unstable wave is pushed aloft and cuts off from a cyclone, the cyclone will become

72. A thunderstorm is present and occurring at your station. In addition, the local noise level is preventing you from hearing the thunderstorm. For observation purposes you would say

73. The force that is responsible for starting the horizontal movement of air over the earth's surface is

74. When using Petterssen's rule, the factors needed for cyclogenesis are upper-level

75. When only high and middle clouds are associated with a warm front, the

76. The frontolytic processes are most effective

77. The stratosphere is characterized by