Residents awoke to frigid air in the Midwest and the northern Rockies, while up to 4 inches of snow blanketed parts of Montana, the National Weather Service reported. Early morning temperatures sank to record lows of 11 degrees in International Falls, Minn., 14 in Duluth, Minn., and 23 in South Bend, Ind. An area of high pressure over the Mississippi Valley was forcing down temperatures, the weather service said. The mercury dropped into the teens and single digits over the northern Rockies, North Dakota and the upper Mississippi Valley, while the readings were in the 20s over the Ohio Valley.
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