FAA Questions/Private Pilot Helicopter/Question #44
weather theoryFAA-published sample question (PRH, Aug 2021)

When warm, moist, stable air flows upslope, it

A

produces stratus type clouds.✓ Correct Answer

B

causes showers and thunderstorms.

C

develops convective turbulence.

Explanation

When moist, stable air is forced up sloping terrain, it cools until it condenses. Because stable air resists vertical motion, the result is a layered, stratus-type cloud or upslope fog (PHAK Ch. 12). Showers, thunderstorms and convective turbulence come from lifting unstable air, not stable air.

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