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9 ominous images of roll clouds

Roll cloud in Missouri

Photo: Dan Bush/NASA

6 of 11

Albany, Mo.

As if this roll cloud didn't look dramatic enough on its own, its front edge was also illuminated by the morning sun, which was just beginning to rise over northern Missouri on June 10, 2005.

Photographer Dan Bush snapped this photo from a moving truck as he chased the cloud, which he estimated to be moving from west to east at about 35 or 40 mph. See more images here.