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Bracing for Round 3: 53 million under severe weather threat across U.S.

A tornado touched down near Oklahoma City, Oklahoma on May 20, 2013 shortly before 4pm EST. (Photo credit: KFOR)

(CNN) — It’s already killed scores of people in a massive tornado that devastated the town of Moore, Oklahoma. And it’s not over yet. The storm system behind Monday’s twister and several…