These “mammatus clouds” were photographed above Hastings, Nebraska, after a destructive thunderstorm in May 2005. Although their formation is not completely understood, these rare clouds usually develop at the base of a thunderstorm, and appear lumpy because of instabilities and temperature differences between sinking and rising air. 

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Kyle Bunch

Managing Director, Social at R/GA. Co-founder of Blogs with Balls and future owner of the MLB's Austin Bats.

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