[USA Today] A full dose of winter is in store for much of the U.S. this week as a polar vortex oozes its way across the nation and a nasty winter storm develops. The north-central U.S. has been enduring dangerous, bitter cold for several days now because of a shift in the vortex from the Arctic into the U.S., AccuWeather said, and no letup in the frigid weather is in sight.
On Tuesday, wind chills as low as 40 to 50 degrees below zero were reported across portions of the northern Plains and Upper Midwest, the National Weather Service said, and the cold will continue: "High temperatures will struggle to make it above zero from Montana to Minnesota through the next few days, with lows in the negative teens and negative 20s."