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A mid-latitude cyclone is a weather phenomenon associated with atmospheric low pressure that takes place in the temperate region between the tropical and polar regions. Hence, they are also known as temperate cyclones, or more rarely, extratropical cyclones. In the northern hemisphere a cyclone rotates in the counterclockwise direction, while it rotates clockwise in the southern hemisphere. The rotation is caused by the Coriolis effect.
Cyclones are generally associated with storms and humidity as the dynamics of a cyclone lead to upward vertical movement which promotes convective activity and generally raises the mean relative humidity. These storms and other local weather phenomena are usually the effects of fronts.
- See also: anticyclone, atmospheric pressure.
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