Add Yahoo as a preferred source to see more of our stories on Google. This winter’s harsh run is intensifying, with some of the coldest air so far this season plunging into New Hampshire this weekend ...

A displaced polar vortex in Canada is set to unleash three waves of Arctic air through mid-December, “delivering the coldest conditions of the season so far,” forecasters at AccuWeather said. “The ...

Add Yahoo as a preferred source to see more of our stories on Google. The stratospheric polar vortex, the winter engine that traps Arctic cold high above the North Pole, is entering its seasonal ...

Michigan and the Great Lakes are bracing for another cold shot later this month — down to single digits in places — as a polar vortex split in the stratosphere nudges frigid Arctic air southward.

The stratospheric polar vortex, the winter engine that traps Arctic cold high above the North Pole, is entering its seasonal collapse. What's left is the lower-level polar vortex core, lingering over ...