An overturned semitrailer rests on its side on the eastbound lanes of Interstate 40, just east of El Reno, Okla., after a reported tornado touched down, Friday, May 31, 2013. (AP Photo/The Omaha World-Herald, Chris Machian) MANDATORY CREDIT

Associated Press
An overturned semitrailer rests on its side on the eastbound lanes of Interstate 40, just east of El Reno, Okla., after a reported tornado touched down, Friday, May 31, 2013. (AP Photo/The Omaha World-Herald, Chris Machian) MANDATORY CREDIT
An overturned semitrailer rests on its side on the eastbound lanes of Interstate 40, just east of El Reno, Okla., after a reported tornado touched down, Friday, May 31, 2013. (AP Photo/The Omaha World-Herald, Chris Machian) MANDATORY CREDIT
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