A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by treacherous conditions.

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

Wind chills could reach –40 C in northern Alberta and roughly –45 C in parts of Saskatchewan, Manitoba ... spell is being referred to as a polar vortex, but Mahdavi said that's a bit ...

Arctic winds from a powerful polar vortex are sweeping across several states ... According to the Windy weather map, temperatures are currently freezing or below in most of the United States ...