Around 40 million people in the U.S. are under a winter storm warning from an unusual blast of severe winter weather.

The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously ...

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

This blast of cold weather is due to activity of the polar vortex.

Some of the coldest air in years is expected to plunge into the High Plains, Midwest and finally the East in the coming days ...

The polar vortex is always around. It is a channel of strong winds high up in the atmosphere that circles the poles. One over ...

The polar vortex is like a giant, swirling pool of super-cold air in the upper atmosphere over the North Pole. Imagine it like ... air can spill out and slide south, making places like the United ...

A series of cold fronts the last few weeks has kept Florida downright chilly, as another winter storm starts to take aim this ...

By Monday, extremely cold air will reach as far south as the Gulf ... that level of cold. The polar vortex, a ring of frigid air typically located near the North Pole, will become stretched ...

This will be due to a polar vortex, an area of strong winds that encircle the Arctic and typically keeps the coldest air locked near the Pole ... and go somewhere south," FOX Weather Meteorologist ...

The general meaning of the Polar Vortex is an upper-air storm that mostly keeps its center near the North Pole. The Polar Vortex ... and the center can dip as far south as Northern Michigan.

A lobe of the polar vortex, a stormy ring that typically keeps the coldest air locked up near the North Pole, will dip southward ... before rapidly moving south and east and encompassing much ...