The Upper Midwest and Northern Plains have been hit by Canada's freezing temperatures. On Thursday, Dec. 4, wind chills ...

A polar vortex may be headed our way later this month. The phenomenon is a low-pressure buildup of cold air that swirls around the polar regions of the Earth. As it expands in the winter, it can send ...

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.

The phrase “historic polar vortex” evokes a country locked in ice from the Great Lakes to the Gulf, but the most reliable ...

Storms, some of which may bring snow, are expected to accompany a push of colder air this week, and the next storm is ...

Temperatures across Indiana are set to be even colder tonight, as temperatures plunge into single digits and at the zero mark, with wind chills dipping well below zero.

High above the North Pole, about 10 to 30 miles above Earth’s surface, sits a massive whirlpool of icy air known as the polar ...

Brace yourselves; winter is coming. "Polar vortex" may have been the weather catchphrase of last winter, but it's coming back and it's bringing snow and freezing temperatures along with it. While it ...

The polar vortex is on the move with its Arctic blasts, but so are storms packing snow and ice. The weather pattern setting ...

A disturbance in the polar vortex could spill icy cold air south into the United States much earlier than usual, the National ...

Another Arctic blast is on the move toward the U.S., bringing the potential for bitter cold.

Winter isn't over just yet. A major shift in the weather pattern could have millions across the United States once again reaching for their winter coats later this month before milder springlike air ...