define advection fog
Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia. advection fog. A type of fog caused by the horizontal movement of moist air over a cold surface and the consequent cooling of that air to below its dew point. Cold air is heated up when it comes into contact with warm ground. Heat is transferred from warm water to the cold air by advection. A type of fog that results from air being cooled following its horizontal movement. This could result from either cold air passing across a warmer sea or water surface while mixing with warm air prevailing there, or the air becoming chilled by coming into contact and mixing with cold air associated with a cold surface.