In Pictures: Arctic chill sweeps over US Midwest

National Weather Service: 'One of the coldest arctic air mass intrusions in recent memory is surging south into the Upper Midwest before spreading across much of the eastern two-thirds of the country'
National Weather Service: 'One of the coldest arctic air mass intrusions in recent memory is surging south into the Upper Midwest before spreading across much of the eastern two-thirds of the country'
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