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Motorists travel slowly on a snow-covered Interstate 24 during a winter storm Wednesday, December 26, 2012, in Paducah, Ky. The storm dumped several inches of snow making travel hazardous. (AP Photo/Stephen Lance Dennee)

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.