From A Week of Tornadoes, one of 25 photos. Lightning from a tornadic thunderstorm passing over Clearwater, Kansas strikes in an open field, on May 19, 2013. A massive storm front swept north through the central United States on Sunday, hammering the region with fist-sized hail, blinding rain and tornadoes, including a half-mile wide twister that struck near Oklahoma City. (Reuters/Gene Blevins)






