Cold air from the arctic sometimes dips southward across the American plains. What to know about the polar vortex.

How the Polar Vortex Can Bring Arctic Blasts to the U.S. Vast weather patterns can carry blasts of frigid air far from the ...

The new year is kicking off with a serious chill as Arctic air, driven by a polar vortex originating in Siberia, prepares to blanket much of the United States. According to The Washington Post, this ...

Here's a riddle for you: What large, gray mass can draw hundreds of shrieking ... Think splashing into 42-degree water only to emerge into air hovering around freezing. Sound like fun?

Some areas of Texas could ring in the new year with below-freezing temperatures -- and even some snow -- as meteorologists track an arctic air mass expected ... but the polar vortex being ...

"Can I give you some polar bear advice ... We tag along with a group from PBI to search for bears on the sub-Arctic tundra - just a few miles from town. The team travels in a tundra buggy ...

At least five people have died in the United States after a winter storm hit a large swathe of the country over the weekend, leading to mass school ... of the polar vortex southwards. The polar vortex ...

Currently, the core of the stratospheric polar vortex is swirling over ... a testament to the frigid air’s grip. If this Arctic air mass materializes as forecast, we may see Great Lakes ice ...

The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes ventures south into the U.S., Europe and Asia. Some experts say such cold air outbreaks are happening more ...