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Explore 2032 Return, Philly Suburb and more!

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

This is a storm front, moving from right to left, of a violent thunderstorm over the Morristown, NJ Town Hall on July 26, 2012. (CNN iReport)

"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."