By NBC News
January 4, 2015

Dangerously cold arctic air masses are due to move across the U.S. starting on Sunday, forecasters warned, bringing the bitterest temperatures so far this winter. Wintry weather on Saturday led to numerous accidents in Michigan, Pennsylvania and Ohio due to snow and ice. Severe storms heavily damaged mobile homes and downed power lines and trees in Mississippi, with two tornadoes confirmed in the state.

Bitter temperatures will sweep the U.S. on Sunday with the first arctic mass set to target the Plains and Great Lakes region and last through Monday…

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