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Discussion

Match each stability condition with its criterion.
List I
A. Absolutely stable
B. Conditionally unstable
C. Absolutely unstable
D. Neutral
List II
1. environmental rate above the dry rate
2. environmental rate below the saturated rate
3. environmental rate equal to the dry rate
4. environmental rate between the two rates

  • A.A-3, B-1, C-4, D-2
  • B.A-2, B-4, C-1, D-3
  • C.A-4, B-2, C-1, D-3
  • D.A-2, B-4, C-3, D-1

Answer: B

The word conditional means the instability appears only once the parcel is saturated. Most atmospheres capable of producing deep convection are conditionally unstable rather than absolutely so. The distinction turns entirely on whether the parcel has reached saturation.

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