| Themes > Science > Earth Sciences > Hydrology, Meteorology, Climatology > Meteorology / Climatology > Clouds and Precipitation > Cloud Types > Mammatus Clouds |
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Mammatus are pouch-like cloud structures and a rare example of clouds in sinking air. Sometimes very ominous in appearance, mammatus clouds are harmless and do not mean that a tornado is about to form; a commonly held misconception. In fact, mammatus are usually seen after the worst of a thunderstorm has passed. |
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