Weather Tidbits: Radiation Fog
This Weather Tidbits explains how radiation fog forms. Radiation fog develops on clear skies and calm winds which are associated with radiation cooling. The cooling leads to condensation in the air just above the ground and if its thick, fog will occur. Radiation fog is most common in late fall and winter; where the longer nights provide longer cooling leading to a greater likelihood of formation. The fog is deepest around sunrise, and the sun “burns off” the fog by sunlight penetrating the fog & warming the ground; thus causing the temperature of the air in contact with the ground to increase. An alternate name to radiation fog is ground fog.