CHRIS MACHIAN/OMAHA HERALD/AP A tornado touches down near El Reno, Okla., Friday, May 31, 2013, causing damage to structures and injuring travelers on Interstate 40. I-40 was closed after severe weather rolled through the area.
CHRIS MACHIAN/OMAHA HERALD/AP
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.
NICK OXFORD/AP Parts of Oklahoma City experience extreme flooding after multiple tornado’s passed through Central Okla. on Friday May 31, 2013 in Oklahoma City. A violent storm formed over the prairie west of Oklahoma City late Friday afternoon, dropped a tornado in a suburb and rolled into the state capital as viewers brave enough to remain above ground watched on statewide television.
CHRIS MACHIAN/OMAHA WORLD-HERALD/AP
A rainbow can be seen north of El Reno, Okla., near U.S. Highway 81 after a tornado touched down Friday, causing damage to structures and injuring travelers on Interstate 40.
JEFF ROBERSON/AP People walk near an overturned truck in an industrial park after strong storms moved through the area Friday, May 31, 2013, in St. Louis.
JEFF ROBERSON/AP Rescue personnel stand near overturned trucks in an industrial park after strong storms moved through the area Friday, May 31, 2013, in St. Louis.