Mammatus over the UK

Mammatus clouds form on the underside of other clouds as the drier air below causes evaporation and the formation of these bulbous features. While commonly observed under the anvil of severe storms, mammatus themselves do not indicate severe weather and can form under clouds other than cumulonimbus, as looks to be the case in this picture from over the UK in May.

Nicky Clarke
Location: Manchester, UK
Date: Late May 2014

Image

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