Every state but Hawaii, California and Florida is likely to get a taste of wind chills of 20 degrees or colder.

America is bracing for the coldest arctic blast of the season as a polar vortex is set to bring 'most severe' cold snap and ...

As the polar vortex stretches its icy grip, America braces for a winter like no other. Discover the forces behind this ...

As we continue to warm moving into February, it appears latest trends suggest a classic "what goes up, must come down" type ...

The polar vortex is expected to remain on the Canadian side of the North Pole, which will keep an abundant supply of Arctic ...

Polar vortex and jet stream are both extending ... polar vortex would shift south of the tropospheric jet stream over North America, with the stretched polar vortex corresponding to the shift.

A rush of Arctic air will plunge parts of North America into bitter cold this weekend, bringing heavy snow, strong winds and frigid temperatures to parts of Canada.

During winter, the polar vortex at the North Pole can loosen up and expand ... Caitlin Looby is a Report for America corps member who writes about the environment and the Great Lakes.

A rush of Arctic air will disrupt the weather pattern across North America starting this ... said the chilly temperatures, caused by a polar vortex spinning across Canada, will “overwhelm ...