Cumulonimbus cloud

Cumulonimbus is a dense, towering, vertical cloud, typically forming from water vapor condensing in the lower troposphere that builds upward carried by powerful buoyant air currents. Above the lower portions of the cumulonimbus the water vapor becomes ice crystals, such as snow and graupel, the interaction of which can lead to hail and to lightning formation, respectively.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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Museum entries, images, and facts are drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses.