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Assertion (A): The onset of rain at the surface can lag its formation aloft by many minutes.
Reason (R): The sub-cloud layer must first be moistened before drops can survive the descent.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: A

Both are true and the reason gives the delay, and the lag is greatest when the layer is initially dry. Radar frequently shows precipitation aloft before any gauge responds. The lag is longest in a deep and initially dry layer.

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