The sky lights up with an array of colors and mammatus clouds as storms skirt around Fort Smith, Ark., Tuesday, April 22, 2008. Mammatus are pouch-like cloud structures and a rare example of clouds in sinking air. Sometimes very ominous in appearance, mammatus clouds are harmless and do not mean that a tornado is about to form; a commonly held misconception.
(Photo: AP/Times Record, Kaia Larsen)
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