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How is an cumulonimbus form?

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Towering Cumulus Stage: The first stage is the towering cumulus stage, or growth stage. The warm, moist air rises and cools, eventually condensing into a cumulus cloud. As condensation occurs, it warms the air (remember, condensation is a warming process), keeping the air inside the cloud warmer than the air around it. read more

Towering cumulonimbus clouds are typically accompanied by smaller cumulus clouds. The cumulonimbus base may extend several miles across and occupy low to middle altitudes - formed at altitude from approximately 200 to 4,000 m (700 to 10,000 ft). read more

During this stage, updrafts keep the water droplets and ice crystals suspended in the cloud. There is no precipitation, and generally no lightning, or thunder during this stage. As the cloud builds to altitudes where the temperature is below freezing, large raindrops and even small hail begin to form. read more

Cumulonimbus clouds form when warm, moisture-laden air travels upward and is cooled, condensing into a tall body of water droplets. Cumulonimbus clouds can reach up to 10 kilometers in height and take on a flat-topped appearance due to the strong winds at high altitudes. read more

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