weather theoryFAA-published question bank (Private Pilot, 2008)
Crests of standing mountain waves may be marked by stationary, lens-shaped clouds known as
A
mammatocumulus clouds.
B
standing lenticular clouds.✓ Correct Answer
C
roll clouds.
Explanation
The crests of standing mountain waves may be marked by stationary, lens-shaped clouds called standing lenticular clouds. Roll (rotor) clouds form lower down, beneath the crests, and mammatus clouds hang from the underside of thunderstorm anvils.
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