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"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."

Mammatus by Ryan McGinnis

Silk Pouches ~ incredible mammatus cloud display on June 26, 2011. The sky was literally exploding about 15 minutes after sunset.

thunderstorm. #storms, #sky, #lIghtning, #photography

Cumulus congestus clouds boil skyward as thunderstorms develope near Norman Oklahoma in early March.