Cumulonimbus Sign Video
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Definition
An exceptionally dense and vertically developed cloud, often with a top in the shape of an anvil. The cloud is frequently accompanied by heavy showers, lightning, thunder, and sometimes hail. It is also known as a thunderstorm cloud.
Source: Essentials of Meteorology: An Invitation to the Atmosphere (fifth edition) by C. Donald Ahrens
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http://www.windows2universe.org/earth/Atmosphere/clouds/cumulonimbus.html
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