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What sort of cloud and rainfall follow from a steep lapse rate?

  • A.Persistent overcast conditions with poor visibility and no precipitation of any kind reaching the surface
  • B.Cumuliform cloud with showers
  • C.Continuous drizzle from a shallow layer of stratus cloud with very little vertical development at all
  • D.Fog

Answer: B

Instability permits vertical motion, so cloud grows upward into cumulus and cumulonimbus and precipitation falls as showers separated by bright intervals. Good visibility between the showers is another characteristic. Drizzle, fog and persistent overcast are all products of stable stratification and would not survive in an unstable air mass.

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