A form of fog caused by the cooling of moist air to below its dew point by the process of heat radiation. Radiation fog usually forms near the surface at night under clear skies and light wind conditions. Also known as ground fog . A form of fog caused by the advection of cold air over a warm water surface or a very saturated soil surface, giving the impression of rising steam. Common over large lakes and near-shore ocean areas during the cold season.
Freezing rain is characterized as either glaze or rime depending on the nature of the ice.
Rain may freeze on the surface because its drops are supercooled and freeze on contact or that the surface is well below freezing. Technically, only the former is considered freezing rain, but the public usually considers any rain that falls and is observed frozen as freezing rain. The deposition of ice crystals on a surface directly from the water vapour in the atmosphere. The process is similar to dew formation except that the temperature of the object must be below freezing, the frost point . The scale was developed by the late Dr T. Theodore Fujita of the University of Chicago.