weather theoryFAA-published question bank (Private Pilot, 2008)
Which weather conditions should be expected beneath a low-level temperature inversion layer when the relative humidity is high?
A
Smooth air, poor visibility, fog, haze, or low clouds.✓ Correct Answer
B
Light wind shear, poor visibility, haze, and light rain.
C
Turbulent air, poor visibility, fog, low stratus type clouds, and showery precipitation.
Explanation
A low-level inversion is a very stable layer, so beneath it the air is smooth, and with high humidity the trapped moisture and pollutants produce poor visibility, fog, haze or low clouds (PHAK Chapter 12). Turbulence and showery precipitation belong to unstable air.
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