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Indiana’s position in the Midwest long has made it prone to volatile changes in weather. In April 2006, tornado-force winds hit Indianapolis just after thousands of people left a free outdoor concert by John Mellencamp held as part of the NCAA men’s Final Four basketball tournament.

And in May 2004, a tornado touched down south of the Indianapolis Motor Speedway, delaying the start of the Indianapolis 500 and forcing a nearly two-hour interruption in the race.

Associated Press writers Cliff Brunt and Ken Kusmer in Indianapolis and Caitlin R. King in Nashville, Tenn., contributed to this report.