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Cumulus congestus clouds

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When the atmosphere becomes unstable and very strong, upward air currents form, Cumulus clouds can grow into Cumulus congestus, or towering cumulus. Cumulus congestus cells may produce light to moderate showers and over a warm water surface, towering cumulus may produce waterspouts. When a large Cumulus congestus cloud begins to produce either a wispy cirrus blow-off or a well-defined anvil-shaped top (the upper portion of the cloud column begins bulging horizontally) or if lightning is seen or thunder is heard, the cloud is automatically classified a different type of cloud: the Cumulonimbus or (thunder)storm.




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