weather theoryFAA-published question bank (Private Pilot, 2008)
What situation is most conducive to the formation of radiation fog?
A
Warm, moist air over low, flatland areas on clear, calm nights.✓ Correct Answer
B
Moist, tropical air moving over cold, offshore water.
C
The movement of cold air over much warmer water.
Explanation
PHAK Chapter 12 explains that radiation fog forms on clear, calm nights when the ground cools by radiation and chills the moist air above it to its dewpoint, typically over low, flat areas. Moist air moving over cold water produces advection fog, and cold air over warm water produces steam fog.
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