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A local resident clears snow from his driveway after an overnight snowfall left many schools and businesses closed for the day, Thursday, Dec. 20, 2012, in Urbandale, Iowa. (AP Photo/Charlie Neibergall)

Winter storms hit U.S.

A winter storm system that blew

through Christmas Day with Gulf Coast tornadoes and snow in the nation's

midsection headed for the Northeast, spreading blizzard conditions that slowed holiday travel all week. The death toll rose to six with car accidents on snow and highways.