WASHINGTON — We are in the middle of a blast of extreme cold weather in D.C. The polar vortex has shifted, spilling cold air ...

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the ...

This blast of cold weather is due to activity of the polar vortex.

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

Americans have been warned to brace for more winter storms as Arctic winds are set to dump more ice and snow amid freezing ...

These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary ...

When there are disturbances in which the Jet Stream weakens, it can become wobbly. This allows the cold air to plunge southwards. A disrupted polar vortex does not happen every year. Very much so what ...

The intense cold snap about to settle over most of Canada and the U.S. has been dubbed a “polar vortex’, but Environment ...

Frigid temperatures engulfed the South on Monday ahead of a winter storm that’s expected to spread heavy snow and disruptive ...

VIRGINIA BEACH, Va. — Looking ahead to next week, a major arctic blast is expected to settle into Hampton Roads and ...

The Arctic air mass will be in Colorado Friday afternoon, but the effects of the polar vortex won't be fully felt until after the sun goes down. Snow will come into the state's high country in two ...