Oklahoma tornadoes: OU's Merv Johnson 'was extremely lucky, but I wasn't very smart' with weather decisions - Article Photos 458/506

Shawnee firefighters and ambulance personnel carefully remove a driver from the smashed cab of his tractor-trailer after it was lifted from I-40 and dropped onto US 177, about 20 feet below. A tornado caused extensive damage along I-40 at the junction with US 177 on the west side of Shawnee Sunday evening, May 19, 2013. Photo by Jim Beckel, The Oklahoman.