Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

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

Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march across the eastern U.S.

High above the North Pole, in a slice of atmosphere rarely noticed and even less understood, a transformation is underway. Over the next 10 days, changes in the stratosphere will upend weather ...

January is shaping up to be the coldest in a decade as the polar vortex dips south across the eastern half of the United States — shocking a nation that has enjoyed an unusually balmy end of the year.

In an early sign of the winter weather that's coming, the dreaded polar vortex is making news yet again. The polar vortex is "ramping up from its summer slumber," said meteorologist Judah Cohen in an ...

In yet another sign that winter weather is either here or will be soon, the dreaded polar vortex is making news yet again. Its potential arrival in the United States over the next few weeks is cause ...

The polar vortex is weakening, which means New England is in for a colder than usual December, with episodic cold snaps. Every year around this time, that phrase — “polar vortex” — starts to buzz ...