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see cloudcloud,
aggregation of minute particles of water or ice suspended in the air. Formation of Clouds

Clouds are formed when air containing water vapor is cooled below a critical temperature called the dew point and the resulting moisture condenses into droplets on
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cumulonimbus (Cb)

cumulonimbus (Cb)
Towering clouds whose tops can rise to 65,000 ft and even higher. They are characterized by typical anvil-shaped tops when fully developed. Cbs, as they are popularly called, are thunderstorm clouds with extreme turbulence in them. They are associated with strong downdrafts under them. These clouds pose the maximum danger to aviation. Both downdrafts and updrafts exist within a cloud. On weather charts, cumulonimbus with clear tops are indicated by the symbol image; those without any clear-cut tops are indicated by the symbol image.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved