weather theoryFAA-published question bank (Private Pilot, 2008)
What would decrease the stability of an air mass?
A
Warming from below.✓ Correct Answer
B
Cooling from below.
C
Decrease in water vapor.
Explanation
Warming the lower layers of an air mass steepens the lapse rate and decreases its stability, which is why sunny afternoons and cold air over warm ground produce convection. Cooling from below and drier air both increase stability.
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