Imagine the polar vortex as a giant, icy whirlpool far above the Earth, keeping frigid Arctic air contained near the north ...

It's going to get cold in Tennessee. Meteorologists predict freezing temperatures for much of the state. Here's the latest.

These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary ...

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 ...

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 ...

The polar vortex is like a giant, swirling pool of super-cold air in the upper atmosphere over the North Pole. Imagine it like a children's spinning top. When the top is spinning fast and steady ...

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 region enacts cold weather measures when temperatures dip to -15 C or it feels like -20 C with the wind chill.

A lobe of the Polar Vortex is going to swing through Ontario just north of Michigan. The upper-air forecast gives us an easy look at this strong winter player. The general meaning of the Polar ...

The polar vortex is a gigantic, circular area of cold air high up in the atmosphere that usually spins over the north pole. It's a normal pattern that's stronger in the winter and usually tends ...