A wall cloud forms near Interstate 35 and Purcell, Okla. on Thursday, May 30, 2013. At least two tornadoes touched down in Oklahoma and another hit Arkansas on Thursday as a powerful storm system moved through the middle of the country. At least nine injuries were reported. (AP Photo/Alonzo Adams)

Associated Press
A wall cloud forms near Interstate 35 and Purcell, Okla. on Thursday, May 30, 2013. At least two tornadoes touched down in Oklahoma and another hit Arkansas on Thursday as a powerful storm system moved through the middle of the country. At least nine injuries were reported. (AP Photo/Alonzo Adams)
A wall cloud forms near Interstate 35 and Purcell, Okla. on Thursday, May 30, 2013. At least two tornadoes touched down in Oklahoma and another hit Arkansas on Thursday as a powerful storm system moved through the middle of the country. At least nine injuries were reported. (AP Photo/Alonzo Adams)
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