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Precipitation efficiency is defined as

  • A.the fraction of the cloud droplets that activate
  • B.the ratio of rain to snow falling in a storm
  • C.the fraction of the sky that is covered by cloud
  • D.the fraction of condensed water that reaches the ground

Answer: D

It accounts for water retained aloft, evaporated below cloud or carried away by the wind. Values vary from a few per cent in dry continental convection to well over half in maritime systems. Efficiency is a property of the environment as much as the cloud.

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