Mammatus clouds are strange, pouchlike protrusions that can form on the underside of a thunderstorm's anvil-
shaped cloud-top. They are caused by cold air sinking downwards and are often a sign of strong storms.  This
sinister-looking example was captured near Aberdyfi in the Autumn of 2004.

Product number 2000-2009013. Email me to enquire about this image: click HERE.

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