Overturned trucks block a frontage road off I-40 just east of 81 in El Reno, Okla., after a tornado moved through the area on Friday, May 31, 2013. (Associated Press)

Photo by: Jim Beckel

Overturned trucks block a frontage road off I-40 just east of 81 in El Reno, Okla., after a tornado moved through the area on Friday, May 31, 2013. (Associated Press)