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. Some people
describe them as like cow's udders, which made this pure coincidence seem so appropriate for a shot! Near Ynyslas,
May 2009, and published in the Guardian newspaper a few days later.
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