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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.
References in periodicals archive ?
With regard to the mean electric field strength in layered rain and cumulonimbus clouds, according to direct experimental measurements by flying directly in the clouds of the electrophysical laboratory, it can reach the level (20-30) kV/m in the pre-threat period (before the transition of these clouds into thunderstorms) [3, 7].
Even the tops of typical cumulonimbus clouds, in contrast, rarely rise out of the troposphere.
Such rain is caused mainly by cumulonimbus clouds that form in a clash of warm and cold air.
If you are fishing well into the afternoon, keep an eye out for those cumulonimbus buildups.
Those cases include a Beechjet 400A that experienced dual flame-out at 38,000ft (11,600m) in November 2005 while flying in clear weather but near cumulonimbus clouds.
Cloud nine is cumulonimbus, which develops to a vast height, with rounded masses of white vapour heaped one on the other.
pathetic fallaciousness of clouds: cumulonimbus mammals, Polonian
It said the plane had passed through tall, dense cumulonimbus thunderclouds.
For example, the larger size of many newer homes, especially those with few large trees around them, makes them easy targets for a fiery bolt from a cumulonimbus cloud.
JUST BEYOND THE eastern range, cumulonimbus build up.
William Rankin was passing over a monstrous cumulonimbus cloud when, at nine miles up, the engine of his F-8 fighter jet quit with a grating, rasping jolt.
Blackburn against Leicester is a whacking great mass of cumulonimbus with few obvious redeeming features, and you could easily be forgiven for finding something better to do than endure 90 minutes of huff and puff from Ewood P ark this afternoon.