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If cloud drops are large but lower air is very dry why can surface rainfall be low?

Answer and explanation

Correct answer: Dry air can evaporate drops before the ground

Answer: A. Large cloud drops contain liquid water and may begin falling, but they must pass through the air below the cloud. If that lower layer is very dry, some or all of the drops can evaporate before reaching the surface. Thus, rainfall may be visible beneath or within the cloud but may weaken greatly or disappear near the ground; this is commonly associated with virga. The reasoning is: large drops form, drops fall, dry air takes up water vapour, and the drops shrink or vanish. B is wrong because large drops do contain water. C is wrong because dry air does not always increase rainfall; it often reduces surface rainfall through evaporation. D is wrong because liquid drops do not turn into rocks. Memory cue: cloud rainfall is not the same as rainfall measured at the ground—always check the air layer between the cloud and surface.

Related tags

Dry Lower AirVirgaSurface RainfallEvaporationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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