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In which situation can clouds be visible but no rainfall be measured at the ground?

Answer and explanation

Correct answer: Falling drops evaporate in dry lower air

Correct answer: C. A visible cloud contains suspended droplets or ice crystals, but visibility of the cloud does not prove that precipitation reaches the ground. If droplets begin falling into a dry layer of air below the cloud, evaporation can remove some or all of their liquid water before they arrive at the surface. Radar or visual observation may show falling precipitation aloft, while a ground rain gauge records no measurable rainfall. This phenomenon is often described as virga when the precipitation evaporates before reaching the ground. A is wrong because very large, heavy droplets are more likely to reach the ground. B is wrong because cold, saturated lower air is less favourable for rapid evaporation. D is unrelated; flooding does not explain why falling drops disappear before measurement. Memory cue: visible cloud plus dry air below can mean “rain that vanishes.”

Related tags

VirgaDry Lower AirSurface RainfallClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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