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Other sightings of "giant wave-like supercell clouds" Similar to the storm formation seen in Nebraska, this storm in Oklahoma has lightnings shooting from its "mouth". Photo by Mark Humpage:

"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."