Home › Part 107 Practice Tests › Aviation Weather Questions › Question 44
Warm, moist air moves over a cold surface and is cooled to its dew point, producing a broad sheet of fog that can persist for days. What type is this?
- A.Radiation fog
- B.Advection fog
- C.Steam fog over a warm lake only
Correct answer
B. Advection fog
Why
Advection fog requires horizontal movement of moist air over a colder surface, plus light winds to mix the cooling. Unlike radiation fog, it does not depend on nighttime cooling and can last well into the day.
Source: FAA-G-8082-22 Ch. 3 · ACS knowledge area: Aviation Weather Sources and Effects · From the Aviation Weather practice bank (WEA-044).