Certified Flight Instructor - Flight Instructor Airplane Practice Exam

Advection fog is a type of fog that occurs when warm, moist air moves horizontally over a cooler surface, such as land or water, causing the air to cool and reach its dew point. This process can lead to the rapid formation of fog, especially in coastal areas where warm air from the ocean overlays cooler land.

The persistence of advection fog is greater than that of radiation fog because it can remain in place for extended periods due to continued air movement and the differential temperatures between the incoming air and the surface, often resulting in a sustained fog condition. This contrasts with radiation fog, which is typically more transient and forms chiefly during the night when the ground cools quickly after sunset.

While advection fog can occur in coastal regions, it is not restricted to them, as it can also form over inland areas if conditions are favorable. The suggestion that it primarily forms during the night or is only present in coastal regions does not accurately capture the broader conditions under which advection fog can develop. Thus, the statement that it can develop rapidly and is more persistent than radiation fog accurately reflects its characteristics.