According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, ...

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

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with ...

Snow and winds are likely to trigger flight cancellations and cause headaches for people traveling to DC for Inauguration Day.

The bitter weather is expected to bring nighttime lows as cold as minus 31 deg C over the weekend. Read more at ...