This image provided by KFOR-TV shows storm clouds moving over Guthrie, Okla., 

This image provided by KFOR-TV shows storm clouds moving over Guthrie, Okla., on Thursday, May 30, 2013. The Storm Prediction Center in Norman, Okla., warns there’s a moderate risk of severe weather over much of eastern and central Oklahoma on Thursday, the same area where a tornado last week killed 24 people. (AP Photo/KFOR-TV) MANDATORY CREDIT
Associated Press
This image provided by KFOR-TV shows storm clouds moving over Guthrie, Okla., on Thursday, May 30, 2013. The Storm Prediction Center in Norman, Okla., warns there’s a moderate risk of severe weather over much of eastern and central Oklahoma on Thursday, the same area where a tornado last week killed 24 people. (AP Photo/KFOR-TV) MANDATORY CREDIT
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