Could early February's blast of cold in the northeastern United States be one of the last appearances of our wintertime foe, the polar vortex? While forecasters can't yet say that for sure, a warmer ...

A weakened polar vortex is allowing frigid air to spill into portions of the U.S. this week, forecasters say. The National Weather Service Weather Prediction Center (WPC) warned in a Thursday update ...

A displaced polar vortex is expected to bring dangerously cold temperatures to much of the U.S. The arctic blast is driven by a weakened polar vortex, which allows frigid air to move south from the ...

Dangerously cold temperatures combined with wind gusts up to 60 mph are expected to cause life-threatening conditions across parts of the Midwest, Mid-Atlantic and Northeast to close out the week, ...