What process results in the formation of advection fog?

Question

Question Quiz BPL Hot Air - Balloon Pilot License - Meteorology

QuizVDS · Accepted Answer

Warm, moist air is moved across cold ground areas

QuizVDS · Answer

Cold, moist air is being moved across warm ground areas

QuizVDS · Answer

Prolonged radiation during nights clear of clouds

QuizVDS · Answer

Cold, moist air mixes with warm, moist air

Id 251 - BPL Hot Air - What process results in the formation of "advection fog"?