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Radar observations support the collision coalescence mechanism because they show

  • A.reflectivity independent of the drop size distribution
  • B.reflectivity developing at temperatures above freezing
  • C.reflectivity appearing only below minus forty degrees
  • D.no reflectivity from liquid clouds at all

Answer: B

Rain echoes forming in clouds entirely warmer than zero cannot involve the ice phase. Such observations in tropical maritime cumulus were among the earliest confirmations of the warm rain process. Ice cannot be responsible above the freezing level.

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