Polar vortex to blast 30 states with life-threatening cold

An arctic air mass settled over New York City and much of the country Sunday evening, bringing a deep freeze and the chance ...
A potent surge of Arctic air starts settling in Monday evening as a massive dip in the jet stream pulls in frigid air across ...
A series of disturbances in the atmosphere is sending the polar vortex south (again) next week with a burst of even colder ...
A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to ...