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Assertion (A): A conditionally unstable atmosphere may produce no convection at all on a given day.
Reason (R): The parcel must first be lifted to its level of free convection by some external mechanism.

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

Answer: D

Both are true and the reason gives what is missing, and the energy needed to reach that level is the convective inhibition. A capping inversion strong enough to prevent it can hold back a very unstable profile all afternoon.

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