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 will bring a cold front with frigid temperatures to nearly 300 million Americans.
Polar vortex set to envelop much of US in freezing temperatures
A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into ...