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

A collapse in the polar vortex is letting Artic air come here. What that means, and why it happens.

Despite being notorious for bringing brutal cold and dangerous wind chills, the polar vortex has a surprising upside.

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

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.

As a winter storm approaches Upstate South Carolina and other regions, here's what to know about deciphering forecaster terms ...

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

The polar vortex has broken, and severe temperatures are set to dominate most of the country in the coming days. Temperatures in the 10s are forecast for much of the Northeast, and subzero ...

Add Yahoo as a preferred source to see more of our stories on Google. The polar vortex has broken, and severe temperatures are set to dominate most of the country in the coming days. Temperatures in ...

A major polar vortex is about to hit the US and could bring weeks of frigid temperatures for millions, with even a chance of ...