Members of Missouri Task Force One search-and-rescue team search a tornado-damaged Home Depot store in Joplin, Mo. on Tuesday, May 24, 2011. Jeff Roberson/AP hide caption

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Tom Cravens of the Pryor, Okla., Police Department searches the rubble of a home near the now closed St. John's Regional Medical Center in Joplin, Mo., on Monday, May 23, 2011. Mark Schiefelbein/AP hide caption

itoggle caption Mark Schiefelbein/AP

The tsunami flows over sea walls towards TEPCO's Fukushima Daiichi nuclear power plant on March 11, 2011. This photo was taken by Tokyo Electric Power Company. TEPCO/AFP/Getty Images hide caption

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Destroyed vehicles are piled up in the parking lot of the Joplin Regional Medical Center in Joplin, Mo., after a tornado moved through the city, damaging the hospital and hundreds of homes and businesses. Mark Schiefelbein/AP hide caption

itoggle caption Mark Schiefelbein/AP

An emergency worker searches a Walmart store severely damaged by a tornado in Joplin, Mo. Charlie Riedel/AP hide caption

itoggle caption Charlie Riedel/AP