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When upward convection occurs in a parcel of moist air, the rising air will cool. Further cooling will cause condensation of the water vapour in the air, and rain may result. If the air is very moist, the cooling results in condensation, and hence the release of latent heat. This causes the rising air to accelerate, and very tall cumulo-nimbus clouds form.
Convection rain is a type of rain which occurs in areas that are intensely heated. It is produced by strong convection currents in the atmosphere.
Strong heating of the land causes the air to rise. When the warm air rises, it expands. Being lighter than surrounding air, it becomes unstable and rises.
As the air rises, it is gradually cooled. When it is cooled below the dew point, the water vapour condenses to form clouds. The cumulus clouds develops into cumulo-nimbus clouds with immense depths of 9 to 11 km.
Convection rain is often accompanied by thunderstorms characterised by thunder and lightning. It is common in afternoon in equatorial regions, where the temperature and humidity is constantly high.
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 | Geography Dictionary. A Dictionary of Geography. Copyright © Susan Mayhew 1992, 1997, 2004. All rights reserved. Read more |
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| Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Convection rain". Read more |
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