weather theoryFAA-published sample question (IRA, Aug 2021)
In what localities is advection fog most likely to occur?
A
Coastal areas.✓ Correct Answer
B
Mountain slopes.
C
Level inland areas.
Explanation
Advection fog forms when moist air moves over a colder surface and cools to its dew point. The Aviation Weather Handbook (18.1.1.1.2) and PHAK Ch. 12 state it is most common along coastal areas, for example sea air blowing over cooler land. Fog formed as air is pushed up mountain slopes is upslope fog, and fog over level inland areas on calm clear nights is typically radiation fog.
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