Fog can be considered a type of low-lying cloud usually resembling stratus, and is heavily influenced by nearby bodies of water, topography, and wind conditions.
- FogConductive, radiational, and evaporative cooling require no lifting mechanism and can cause condensation at surface level resulting in the formation of fog.
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Dew point
1 linksTemperature to which air must be cooled to become saturated with water vapor, assuming constant air pressure and water content.
Temperature to which air must be cooled to become saturated with water vapor, assuming constant air pressure and water content.
In the air, the condensed water is called either fog or a cloud, depending on its altitude when it forms.
Water vapor
1 linksGaseous phase of water.
Gaseous phase of water.
The condensation of water vapor to the liquid or ice phase is responsible for clouds, rain, snow, and other precipitation, all of which count among the most significant elements of what we experience as weather.
Fog and clouds form through condensation around cloud condensation nuclei.
Stratus cloud
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Stratus clouds are low-level clouds characterized by horizontal layering with a uniform base, as opposed to convective or cumuliform clouds that are formed by rising thermals.
These clouds are essentially above-ground fog formed either through the lifting of morning fog or through cold air moving at low altitudes over a region.
Warm front
0 linksDensity discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient.
Density discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient.
Fog can also occur preceding a warm frontal passage.
As it cools, any water vapor that is present will condense and form extensive cloud cover.