A bitter mass of cold air extended its grip across much of the United States early Friday morning. The upper Midwest, Ohio Valley, New England and even the Southeast suffered under dangerous temperatures and brisk winds.
In Minneapolis, Minnesota, it was minus 17 degrees early Friday, and the forecast high was only 8 degrees, CNN affiliate KARE reported.
Minnesotans are famous for embracing frigid weather, but this wave even has them staying indoors. A couple hundred schools around Minneapolis either called off classes all together or started late Thursday, KARE said. 
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All About Winter Weather
