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Shelf Cloud in Oklahoma, June 2014 - A shelf cloud advancing over the Oklahoma Prairie, June 1, 2014.

sHELf cLoud - Last night's amazing shelf cloud in eastern South Dakota. Photography by sHELf cLoud

Storm of June - Waiting for incoming thunderstorm with big cold front shelf cloud. Photography by Jure Batagelj

The Crossing - Shelf cloud in western Nebraska. June 2nd, 2015. Photography by Mike Olbinski

monster lightning with shelf cloud | monster lightning flash with approaching shelf cloud. Photography by Allard

Shelf Cloud Approaching - A shelf cloud looms over a tranquil bay - an ominous harbinger of changing weather. Photography by Bruce Christopher