Meteorology Test Ch. 5

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1. Relative humidity in cities is usually _____ compared to rural areas. lower
2. What is the basic reason why condensation is not very important in causing a cloud droplet to grow to raindrop size? condenation is too slow
3. Dew point is the temperature at which water vapor in the air begins to condense. The temperature inside a cloud would therefore be... about equal to the dew point
4. The _______ cloud may have an "anvil head" cumulonimbus
5. A ________ consists of two compartments each capable of holding 0.025 cm of water. tipping-bucket gauge
6. When warm moist air moves over a cold surface, _______ fog may result. advection
7. Clouds, dew, and frost all form because air has become saturated. This condition of saturation is usually caused by... the air being cooled
8. If ice crystals form in this cloud, they will experience the cloud environment as having a relative humidity of... more than 100%
9. A halo around the Sun or Moon indicates the cloud _______ is present. cirrostratus
10. The necessary conditions for hail formation include strong upward vertical motion and... large numbers of supercooled droplets
11. Of the following cloud types, which is most likely to produce the most rain? nimbostratus
12. A cloud type that develops as a consequence of local convection is... cumulus
13. A wintertime form of precipitation that consists of small ice particles is called... none of these
14. The most common way for air to be cooled in order that a cloud may form is by... rising and expanding
15. Freezing rain (ice storm) or sleet occurs when... upper air is warm and surface air is cold
16. Which type of cloud is most likely to form a halo around the Sun or Moon? cirrostratus
17. This cloud sometimes produces mare's tails. cirrus
18. This growth from cloud droplet to raindrop occurs mainly because of... collision and coalescence
19. The intensity of rainfall can be calculated with data from a... weighing gauge
20. The cloud form that is best described as sheets or layers that cover much or all of the sky is termed: alto
21. Wind speeds in the city, compared to rural areas, are... about 25% less
22. Why are high altitude clouds always so thin? very little water vapor is present
23. A cumulus cloud is recognized mainly by its... obvious vertical dimension
24. Atmospheric electricity is believed to play an important role in... collision-coalescence process
25. This fog results from adiabatic cooling none of these (upslope)
26. The ______ may result in snow or rain. Bergeon process
27. The word 'radiation' in the term radiation fog refers to... radiant energy lost by the ground
28. Supercooled water is water which is... still liquid at temperatures below 0degreeC
29. In order for water condensation to occur, a and b
30. Clouds are classified and named according to their altitude and... form or appearance
31. Clouds that form in air that is very stable will usually be... stratus
32. Which one of the fogs listed below may be categorized as an evaporation fog? steam fog
33. The conditions that persist along the West Coast of the US that are conducive to fog formation are, moist air moving over a cold surface
34. Clouds and precipitation form in the air primarily due to... air being cooled as it rises
35. Which of the following is not generally true of urban climates? higher relative humidity
36. One aspect of the _______ theory relies on the fact that different-sized cloud droplets fall at different speeds. collision-coalescence process
37. Which of the following does not contribute to urban-induced precipitation increases? higher relative humidity in cities
38. Thunder and lightning are associated with the _______ cloud. cumulonimbus
39. A _______ is a layer of dark gray clouds that produces precipitation. nimbostratus
40. The formation of raindrops by collision and coalescence of smaller cloud droplets is strongly inflenced by... electrical charges on the droplets
41. Clouds which have extensive vertical dimensions are... cumulus
42. The most common source of cloud condensation nuclei is... combustion by-products (pollution)
43. Condensation nuclei may be formed from... all of the above
44. The _______ makes use of a spring balance. weighing gauge
45. A ________ magnifies rainfall ten times. standard rain gauge
46. "Anvil head" is a term applied to: cumulonimbus clouds
47. The most important process for cloud formation in the atmosphere is... cooling by expansion of the air
48. This fog is found in valleys at night and in the early morning: radiation fog
49. Cumulus clouds... all of these
50. The water content or volume of a raindrop is approx. ____ times that of a typical cloud droplet. 1 million
51. The cloud droplets in a cloud are formed by water vapor molecules and... condensation nuclei
52. Dew is most likely to form on... clear calm nights
53. Hail is most commonly associated with... cumulonimbus clouds
54. The _______ cloud is confined to the middle height range. altostratus
55. Hail suppression: relies primarily on cloud seeding with silver iodine
56. Pollutants may: all of the above
57. The important difference between liquid droplets and ice crystals in a supercooled cloud is that ice crystals... grow much more rapidly
58. Cloud seeding is used: in all of the ways listed above
59. Which of these is a mid-level cloud? none of these
60. The process by which a cloud droplet first forms is condensation
61. Fog is usually a result of an air having been... either a) or c)
62. Why do clouds represent a source of heat for the atmosphere? cloud formation releases latent heat to the air
63. This method of frost prevention relies heavily on the release of latent heat of fusion: sprinklers
64. Which of these clouds is least likely to produce precipitation that reaches the ground? cirrostratus
65. Cloud seeding experiments have yielded the result of... all of the above
66. Freezing nuclei are part of the... Bergeon process
67. Cloud seeding with silver iodine is based on the... Bergeon process
68. On which day of the week would someone living in or downwind of a city expect the least precipitation ( on averagre)? Sunday
69. The _______ is associated with supercooled clouds. Bergeon process