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If surface rainfall is low but falling water from cloud is seen on radar what explanation is possible?

Answer and explanation

Correct answer: Drops evaporated in dry lower air

Correct answer: A. Radar can detect hydrometeors, such as raindrops or ice particles, above the ground. However, precipitation seen aloft does not guarantee that an equal amount reaches the surface. If the air below the cloud is dry, falling droplets can evaporate while descending. The radar echo may therefore show precipitation in the air even when the rain gauge records little or none at the ground. This situation is commonly associated with precipitation that evaporates before reaching the surface. B is wrong because the radar evidence indicates water or ice particles are present aloft. C is wrong because the statement is an absolute claim and does not explain the precipitation signal. D is wrong because surface precipitation can be measured with rain gauges and other instruments, even though measurements may differ from radar estimates. Memory cue: “aloft is not always at the ground.”

Related tags

VirgaSurface RainfallRadar PrecipitationClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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