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Derecho clouds over Philadelphia. By tcherjohn via CNN iReport. These skies were seen this evening over the Manayunk neighborhood in Philadelphia and in an immediate Philly suburb. #storm

"Mammatus clouds are most often associated with the anvil cloud and severe thunderstorms. They often extend from the base of a cumulonimbus, but may also be found under altocumulus, altostratus, stratocumulus, and cirrus clouds, as well as volcanic ash clouds. When occurring in cumulonimbus, mammatus are often indicative of a particularly strong storm or perhaps even a tornadic storm."

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