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9 ominous images of roll clouds

Roll cloud and lightning in Belgium

Photo: Joe Thomissen/Flickr

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Kanne, Belgium

This loosely organized roll cloud may not be as smooth or tubular as some of its relatives, but thanks to the lightning bolt behind it — and the quick shutter finger of photographer Joe Thomissen — it still makes for a pretty impressive scene. Thomissen snapped this shot as a storm system drifted over southeastern Belgium on June 28, 2011.