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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."

A "Skypunch" in Switzerland. This rare phenomenon occurs when ice crystals form above the clouds and fall downward.

Storm forming one late May afternoon in the town of Terry eastern Montana