FILE - This April 30, 2017, file photo, provided by the Warren County Emergency Management Agency shows what looks like a tornado that approached Vicksburg, Miss. A new study finds that tornado activity is generally shifting eastward to areas just east of the Mississippi River that are more vulnerable such as Mississippi, Arkansas and Tennessee. And it's going down in Oklahoma, Kansas and Texas. (Jerry Briggs/Warren County Fire Department via Warren County EMA via AP, File)
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