As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

The Greater Toronto Area could feel as cold as -32 C this weekend with "the coldest air of the season" set to arrive, ...

To understand what Americans are experiencing with this winter blast, we need to look more than 20 miles above the surface of ...

A polar vortex brings bitterly cold Arctic air into southern Ontario. Here’s what it is and what you can expect.

Parts of Canada are about to experience extreme cold thanks to a polar vortex. But what is a polar vortex? CBC Kids News ...

Environment Canada has issued weather warnings for most of Canada over a 'high or moderate impact level' cold blast that is ...

Microbes across Earth's coldest regions are becoming more active as glaciers, permafrost and sea ice thaw, accelerating ...

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...

Bitterly cold temperatures have hit the Greater Toronto Area, and while there's a brief reprieve on Wednesday, the chilly ...

(CNN) — 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 ...

(CNN) — An arctic air mass has descended into the US, and a disrupted polar vortex will keep the nation in the freezer at times deeper into December. More than 200 million people will wake up to ...