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Dew Point
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Revision as of 12:31, 15 December 2010 by John.Barrass (Talk | contribs)
| Article Information | ||
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| Category: | Weather | 
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| Content source: | SKYbrary | 
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| Content control: | EUROCONTROL | 
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Definition
The Dew Point is the air temperature at which a sample of air would reach 100% humidity based upon its current degree of saturation.
Description
Once the relative humidity of a mass of air becomes 100%, then if the temperature falls it cannot hold all of the water vapour within it. The excess water vapour will then condense into cloud.
When observing successive weather reports (METARs), a reducing gap between the actual temperature and the Dew Point temperature gives an indication of impending low visibility conditions and the posibility of fog.