Home torm clouds approach Huntsville, Alabama on April 27th, 2011. (Photo credit: Nancy Vreuls of NASA/MSFC) torm clouds approach Huntsville, Alabama on April 27th, 2011. (Photo credit: Nancy Vreuls of NASA/MSFC)

torm clouds approach Huntsville, Alabama on April 27th, 2011. (Photo credit: Nancy Vreuls of NASA/MSFC)

torm clouds approach Huntsville, Alabama on April 27th, 2011. (Photo credit: Nancy Vreuls of NASA/MSFC)

torm clouds approach Huntsville, Alabama on April 27th, 2011. (Photo credit: Nancy Vreuls of NASA/MSFC)

A satellite image of a supercell thunderstorm with overshooting tops over Kansas. (Credit: NWS)
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