Duh-what-choo? Find out more about the possible derecho threatening millions of Americans.
The derecho that struck southeastern Kansas, southern Missouri and southwestern Illinois in May 2009 was the first to be classified a "Super Derecho." Thirty-nine tornadoes were reported, along with baseball-sized hail and wind gusts of 106 mph reported in Carbondale, Ill.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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