NORFOLK, Va. — Have you ever wondered why some winters are mild while others bring freezing temperatures and snowstorms? One of the key players in these dramatic shifts is something called the polar ...

Another round of bone-chilling air from the polar vortex could invade the central and northeastern US this weekend and potentially produce the first significant snowstorm of the season for the ...

Add Yahoo as a preferred source to see more of our stories on Google. Ready for some serious cold? The planet's most extreme cold air will be barreling into the central and eastern United States this ...

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 ...

Grab your coats, it's getting chilly. A polar vortex broke, and severe temperatures are set to dominate most of the United States, including the Midwest, in the coming days. The polar vortex will ...

A Polar vortex has covered the Philadelphia region under a canopy of frigid temperatures, but many people may not realize what a Polar vortex actually is, and the dangers — like frostbite — such ...

The wall that keeps cold air contained in the Arctic is called the polar vortex. There's been a "displacement" in the polar vortex, which allows Arctic air to escape to the south. An "arctic frontal ...

Just a few days into December, an arctic air mass has swept into the United States, bringing subzero morning lows and daytime highs stuck in the teens for 30 million Americans in the Northern Plains, ...

CLEVELAND — The temperature outside was so cold that your fingers, toes, nose and cheeks felt like they were burning. A harsh Arctic cold wave brought record-breaking temperatures to the United States ...