weather theoryFAA-published question bank (Private Pilot, 2008)
What clouds have the greatest turbulence?
A
Towering cumulus.
B
Cumulonimbus.✓ Correct Answer
C
Nimbostratus.
Explanation
Cumulonimbus clouds (thunderstorms) contain the strongest updrafts and downdrafts and are the most turbulent clouds, as PHAK Chapter 12 and AIM 7-1-26 describe. Towering cumulus are turbulent but less so, and nimbostratus are stable, stratiform rain clouds.
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