how fog forms-when cool air passes over a warm body of water or moist land. In general we see that fog is formed whenever there is a temperature difference between the ground and the air. When the humidity is high enough and there is enough water vapor or moisture fog is sure to form

4 types of fog

radiation fog- results when the ground loses heat through radiation usually at night, ground is warmer than the air, and increases the dew point when the air cools due to the lose of radiation the dew point is reached and a cloud and or fog is formed.

advection fog- when warm, moist air, moves horizontally over a cold surface such as snow- covered ground or a cold ocean current ( sea to land)

upslope fog- created by adiabatic cooling when humid air climbs a topographic slope.

evaporation fog- when water vapor is added to cold air that is already near saturation.

Big image