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Inversion (meteorology)
Deviation from the normal change of an atmospheric property with altitude / From Wikipedia, the free encyclopedia
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In meteorology, an inversion (or "temperature inversion") is a layer of warmer air held above colder air. Normally, air temperature gradually decreases as altitude increases, but in an inversion this relationship is reversed.[2]
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![Temperature inversion in the Lake District](http://upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Temperature_inversion_in_the_Lake_District.jpg/320px-Temperature_inversion_in_the_Lake_District.jpg)
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An inversion traps air pollution, such as smog, close to the ground. An inversion can also suppress convection by acting as a "cap". If this cap is broken for any of several reasons, convection of any moisture present can then erupt into violent thunderstorms. Temperature inversion can cause freezing rain in cold climates.