Arctic blast from polar vortex to send temperatures plunging across the U.S. Here’s how cold it will get. Trump's inauguration in Washington, D.C., has been moved indoors due to the frigid forecast.

Dust off the parkas. After a mild December, the polar vortex is set to send an arctic blast into the US later this week.

Polar vortex: Arctic plunge to bring another cold blast to Cincinnati We've already fallen as low as 1° this year. Another dip in the polar vortex makes that possible for Cincinnati again next week.

Northeast faces ‘ferocious Arctic blast’ and wind chills near minus-60 Back-to-back severe cold spells are affecting the Lower 48. By Saturday, the wind chill in Boston could near minus-30.

A powerful Arctic outbreak tied in part to the polar vortex is set to send temperatures by next week tumbling down to as cold as 25 to 35 degrees Fahrenheit below average for mid-January ...

An arctic blast will send temperatures across the United States plummeting as bitterly cold air that originated in Siberia will arrive from Canada by week’s end, bringing with it dangerously ...

Cold air from the arctic sometimes dips southward across the American plains. What to know about the polar vortex.

Tuesday morning will be cold enough to delay the start of school for some districts on the Front Range.

The first bitterly cold front to reach Oklahoma this winter will bring overnight temperatures below 20 degrees.

The polar vortex's icy grip on much of America has Arctic Greenland seeming like a toasty vacation spot by comparison.

An arctic blast will send temperatures across the United States plummeting as bitterly cold air that originated in Siberia will arrive from Canada by week’s end, bringing with it dangerously ...

A sudden stratospheric warming event reversed the winds that make up the northern polar vortex on March 9. A new animation shows the vortex also moved away from the Arctic towards Europe.