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.
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Prolonged polar vortex has much of US preparing for life-threatening cold, pipe-bursting temperatures
A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar ...