An arctic air mass will channel temperatures 20-30 degrees below already historically cold January averages. The South braced for a rare winter storm.

The 7 a.m. wind chill values were in the 30s and 40s below zero throughout Minnesota, including -35 in the Twin Cities. When you zoom out to see more of Minnesota and the entire region, it reveals the expansive area of Siberian air that has been spun south by a stretching polar vortex.