MIST AND FOG
Fog is denser than mist i.e. has more moisture.
Both hinder visibility although fog reduces visibility to less than a kilometre.
When fog mixes with smoke its called smog.
How They Form
- Moist air cools below dew point.
- Condensation takes place.
- The resultant water droplets remain suspended in the air.
Types of Fog
- Radiation Fog
- Type formed when moist air is cooled below dew point as a result of intense radiation on the ground at night.
- Advection Fog
- Type formed when moist air from the sea moves horizontally over a cold surface e.g. snow covered ground.
- Orographic/Hill/Upslope Fog
- Type formed when moist air is cooled after climbing a hill or mountain.
- Evaporation Fog
- Type formed when water vapour is added to cold air that is already near saturation causing excess water vapour to condense and form fog.
- Frontal Fog
- Type formed when warm moist air is cooled from below as it rises over a cold air mass.
- Steam Fog
- Type formed when moist air passes over the surface of a much warmer fresh water body.
- The warm water is cooled from above and condensing water vapour forms fog. It appears to be steaming.
- Ice Fog
- Type formed when water vapour is converted directly into ice crystals when temperatures are below freezing point.
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