weather theoryFAA-published question bank (Private Pilot, 2008)
In which situation is advection fog most likely to form?
A
A warm, moist air mass on the windward side of mountains.
B
An air mass moving inland from the coast in winter.✓ Correct Answer
C
A light breeze blowing colder air out to sea.
Explanation
Advection fog forms when warm, moist air moves over a colder surface; PHAK notes it is most common along coastal areas, often when moist air moves inland from the coast over colder ground in winter. Moist air on the windward side of mountains produces upslope fog, and cold air moving over warmer water produces steam fog.
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