A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.

According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, about 10 to 30 miles above the North Pole, during the winter season. It is ...

Forecasters warn that a split polar vortex is set to bring a 'large supply of cold air' to North America in mid-February as a ...

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the South.

Millions of people across the U.S. will experience subzero or below-average temperatures in the coming days as a polar vortex coming from ... coming for most of the US in the coming days.

Editor's Note for Sat. Jan. 18: A polar vortex is set to impact much of the US. Click here for the latest update. A polar vortex is forecasted to blanket most of the continental United States in ...

A lobe of the polar vortex, a stormy ring that typically keeps the coldest air locked up near the North Pole, will dip southward into the United States this weekend into next week. Polar air ...

When it wobbles or weakens, chunks of that super cold air can spill out and slide south, making places like the United States suddenly feel bone-chillingly cold. A weak vortex allows more arctic ...

The vortex is essentially an area of low pressure in the upper layers of the atmosphere over the polar region up north. This ...