Duh-what-choo? Find out more about the possible derecho threatening millions of Americans.
Derecho warnings usually come hours in advance, and meteorologists urge those in a derecho's path to take precautions similar to an approaching tornado or other severe storm -- secure loose items outside, bring in furniture and other equipment, seek shelter in a sturdy structure and stay away from windows.
Jessica Rinaldi / Reuters
Pete Souza/White House Photo
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