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Strange and unusual cloud formations - Mammatus clouds have been seen in many places, especially tornado-prone ones like the Midwestern United States. They are frequently found on the bottom of thunderstorm anvils and indicate large water droplets and heavy rain.
"Oh, I have slipped the surly bonds of earth, And danced the skies on laughter-silvered wings; Sunward I've climbed, and joined the tumbling mirth Of sun-split clouds...and done a hundred things You have not dreamed of...wheeled and soared and swung High in the sunlit silence." High Flight
Norfolk Nebraska clouds before the storm.... 4/14/2012 "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."