Meteorology

Fog is a weather phenomena which reduces vertical and horizontal visibility. There are different kinds of fog based on its origin. The fog is the condensate water vapor caused by thermal processes in atmosphere.

One of the most common reason of forming the fog is the air is being cooled down to the temperature of dew point after sunset.

In aviation fog is reported whenever the horizontal visibility is reduced below 2000m. The density of fog is reported in so-called runway visual range, which reports the horizontal visibility thru the fog along the runway.

Abbreviation used to report fog in aviation meteorological reports and forecasts is “FG”.