weather theoryFAA-published question bank (Private Pilot, 2008)
The conditions necessary for the formation of cumulonimbus clouds are a lifting action and
A
unstable air containing an excess of condensation nuclei.
B
unstable, moist air.✓ Correct Answer
C
either stable or unstable air.
Explanation
Cumulonimbus clouds need a lifting action plus unstable air with enough moisture, as PHAK Chapter 12 explains. Stable air does not keep rising to build cumulonimbus, and an excess of condensation nuclei is not a requirement.
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