Fog and mist are clouds at ground level, which result from moisture condensation and they may extend far into atmosphere. Fog and mist differ in visibility. There are many types of fog and this article intend to provide deep explanation and beautiful images related to various types of fog.
mist forms when moist air cool below dew point,condensation takes place but resultant water droplets remain suspended in the air. This causes reduction in visibility to between one and two kilometres. On the other hand fog is like mist and forms in the same way but is much denser as it reduces visibility to less than a kilometre. There are various types of fog depending on their mode of formation.
I hope by this simple introduction i have clarified the difference between mist and fog however the intention of this article is to provide and guide you in the understanding of various types of fog so do not lose focus on that.
the following are the major types of fog
Advection fog; this is caused by movement of warm moist air over cold land or water surface. This results into condensation it is common in coastal areas.
Radiation fog; this occur when land surface is suddenly cooled by radiation where air upon it become chilled which results into condensation. It is common in hilly areas.
frontal fog; this forms due to passage of warm air over cold air. The warm air is therefore chilled to form fog. It is formed when warm air is cooled from below as it raises over the cold air. it is usually formed at front of depression.
Steam fog; this form is comparatively rare, but it is included for meteorological interest. It is formed when a cold air passes over a much warmer water surface so that water appear to steam. As warmer water is cooled from above it appear to be steaming as the condensing water above it forms a fog. When temperature are below freezing point, the water vapor is converted directly into ice crystals to form ice fog.
Hill fog; this is simply low sheet cloud which may envelope for example the hills. It is formed by cooling of moist air stream advancing inland through the hills. The middle latitude are liable to spells of hill fog at any time of the year during unsettled weather.
Smog fog; this is fog plus smoke and industrial pollutants like carbon dioxide, sulphur dioxide and nitrogen dioxide. Smog is common in big industrial cities due to high emissions of pollutants as mentioned earlier. Example of areas which experience smog fog include Ruhr industrial area of German.
Rime; when a fog composed of super cooled droplets is driven by the slight wind against prominent objects such as telegraph poles wires and trees. The drops freezes into them as rime. The temperature of both droplets and of the objects is below freezing point.
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