Duh-what-choo? Find out more about the possible derecho threatening millions of Americans.
Roughly every four years, a derecho breaks out of the Midwest, crosses the Appalachian Mountains and heads for the Atlantic without dissipating.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
iStock / damircudic
Warner Bros. Television
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