weather theoryFAA-published sample question (PAR, 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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