weather theoryFAA-published question bank (Private Pilot, 2008)
What are characteristics of unstable air?
A
Turbulence and good surface visibility.✓ Correct Answer
B
Turbulence and poor surface visibility.
C
Nimbostratus clouds and good surface visibility.
Explanation
Unstable air is characterized by vertical currents, hence turbulence, and good surface visibility because the mixing carries haze and pollutants aloft (PHAK Chapter 12). Poor visibility and nimbostratus clouds are typical of stable air.
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