weather theoryFAA-published question bank (Private Pilot, 2008)
An almond or lens-shaped cloud which appears stationary, but which may contain winds of 50 knots or more, is referred to as
A
an inactive frontal cloud.
B
a funnel cloud.
C
a lenticular cloud.✓ Correct Answer
Explanation
Standing lenticular (lens- or almond-shaped) clouds form at the crests of mountain waves; they look stationary because air continually condenses on the upwind side and evaporates on the downwind side, even though winds through them may exceed 50 knots. Funnel clouds are associated with tornadoes, and 'inactive frontal cloud' is not a cloud type.
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