Puzzling Weather

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Mammatus clouds are pouchlike formations protruding from the underside of cumulonimbus clouds. They are formed by downdrafts in which the air is cooler than the surrounding air. Though often observed in severe thunderstorms, mammatus do not produce severe weather themselves. © University Corporation for Atmospheric Research. Want to know more about thunderstorms? Go to JetStream - an Online School for Weather.

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