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Side A ------ Side B
The two most important properties that should be relatively homogeneous at the same altitude in an are mass are... ------ moisture content and temperature
An air mass from the Gulf of Mexico is called: ------ mT
An air mass from the Gulf of Mexico that moves northward over the U.S in winter would be labeled... ------ mTw
The air mass type most likely to form thunderstorms is... ------ mT
In North America the ______ air mass forms only in the summer. ------ cT
The pronounced cooling that occurs on continents at high latitudes during winter leads to the formation of ____ air masses. ------ cP
An ideal source region of air masses should be... ------ physically uniform
An mP air mass is... ------ humid and cold
The cP air mass in North America originates in... ------ interior Alaska and Canada
Characteristics of an air mass source region include... ------ uniformity of temperature and moisture
The air masses that have the greatest influence on weather conditions in the Midwestern United States are... ------ cP and mT
An air mass source region... ------ is characterized by a general stagnation of atmospheric circulation
Why are cT air masses of minor importance for the U.S? ------ no large source region is near the U.S
The typical amount of time it takes for an air mass to pass over a given area is on the order of a few... ------ days
An air mass is often modified as it moves over the Earth's surface. This modification is largely due to ------ contact with the ground below
Air mass source regions are least likely to come from... ------ middle-latitude regions
The coldest and driest winter air mass in North America is the... ------ cA
Which of the following is not an air mass that influences North America? ------ mA
Air mass source regions tend to be dominated by... ------ slow moving anticyclones
The ____ air mass often originates as a different air mass in Siberia and is subsequently altered. ------ mP
Why are maritime air masses from the north Atlantic of only limited concern for weather in the U.S? ------ prevailing winds move them away from the U.S
The _____ air mass provides much of the moisture for precipitation in the central and eastern United States. ------ mT
Which of the following occurs only in summer in North America? ------ cT
Most of the precipitation for the region east of the Rocky Mountains comes from... ------ mT air masses
A cT air mass is... ------ warm and dry
Which of these is not a process by which air masses are modified?  ------ calm winds
"Lake-effect" snow is associated with the ____ air mass. ------ cP
The ____ air mass may produce an occasional "northeaster" in the winter. ------ mP
An air mass is a body of air with... ------ similar values of temperature and moisture in the horizontal
The stability of an air mass can be affected by... ------ a, b, and c
When an air mass is warmer than the surface over which it is moving... ------ the air becomes more stable
When an area is experiencing several consecutive days of rather constant weather, it is experiencing... ------ air mass weather

Side A ------ Side B
The two most important properties that should be relatively homogeneous at the same altitude in an are mass are... ------ moisture content and temperature
An air mass from the Gulf of Mexico is called: ------ mT
An air mass from the Gulf of Mexico that moves northward over the U.S in winter would be labeled... ------ mTw
The air mass type most likely to form thunderstorms is... ------ mT
In North America the ______ air mass forms only in the summer. ------ cT
The pronounced cooling that occurs on continents at high latitudes during winter leads to the formation of ____ air masses. ------ cP
An ideal source region of air masses should be... ------ physically uniform
An mP air mass is... ------ humid and cold
The cP air mass in North America originates in... ------ interior Alaska and Canada
Characteristics of an air mass source region include... ------ uniformity of temperature and moisture
The air masses that have the greatest influence on weather conditions in the Midwestern United States are... ------ cP and mT
An air mass source region... ------ is characterized by a general stagnation of atmospheric circulation
Why are cT air masses of minor importance for the U.S? ------ no large source region is near the U.S
The typical amount of time it takes for an air mass to pass over a given area is on the order of a few... ------ days
An air mass is often modified as it moves over the Earth's surface. This modification is largely due to ------ contact with the ground below
Air mass source regions are least likely to come from... ------ middle-latitude regions
The coldest and driest winter air mass in North America is the... ------ cA
Which of the following is not an air mass that influences North America? ------ mA
Air mass source regions tend to be dominated by... ------ slow moving anticyclones
The ____ air mass often originates as a different air mass in Siberia and is subsequently altered. ------ mP
Why are maritime air masses from the north Atlantic of only limited concern for weather in the U.S? ------ prevailing winds move them away from the U.S
The _____ air mass provides much of the moisture for precipitation in the central and eastern United States. ------ mT
Which of the following occurs only in summer in North America? ------ cT
Most of the precipitation for the region east of the Rocky Mountains comes from... ------ mT air masses
A cT air mass is... ------ warm and dry
Which of these is not a process by which air masses are modified?  ------ calm winds
"Lake-effect" snow is associated with the ____ air mass. ------ cP
The ____ air mass may produce an occasional "northeaster" in the winter. ------ mP
An air mass is a body of air with... ------ similar values of temperature and moisture in the horizontal
The stability of an air mass can be affected by... ------ a, b, and c
When an air mass is warmer than the surface over which it is moving... ------ the air becomes more stable
When an area is experiencing several consecutive days of rather constant weather, it is experiencing... ------ air mass weather