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A large storm cell, which reportedly produced a multiple vortex tornado, passes south of El Reno, Oklahoma May 31, 2013. The National Weather Service issued a tornado emergency for parts of Oklahoma on Friday, describing weather conditions as "particularly dangerous" a day after more than a dozen reported twisters ripped through the region. REUTERS/Bill Waugh (UNITED STATES - Tags: DISASTER ENVIRONMENT TPX IMAGES OF THE DAY)
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