If you've ever wondered why winter sometimes flips from mild to brutally cold, the answer might be hiding 20 miles above your head. That's where a rare atmospheric phenomenon called sudden ...

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, ...

The polar vortex is sending arctic blasts and chilly temperatures to most of the United States, and states from Texas to Oklahoma could see snow, sleet and ice. As of Wednesday, Jan. 21, millions of ...

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest, Mid-Atlantic and Southern U.S. are expected to see below-freezing ...

It was the winter weather nightmare nobody in Texas saw coming, a Lone Star catastrophe of unprecedented power outages and failed water systems and a still-rising death toll of at least two dozen. At ...

Another brutally cold weekend is on the way as a piece of the Polar vortex dips out of the Arctic Circle, sending frigid air across half of the United States while the other half warms up. Texas will ...

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest, Mid-Atlantic and Southern U.S. are expected to see below-freezing ...