Polar vortex maps show where arctic blast is set to freeze the U.S. as far as the Deep South
A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.
The Washington Post17d
These maps show how winter has flipped upside down in the U.S.
At the same time, the polar jet stream often took wide, looping turns from western North America into the South, where it met an invigorated and moisture-laden subtropical jet stream. The path of ...