Cities across the U.S. are bracing for cold temperatures as a polar vortex arrives, bringing temperatures down to much below ...

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

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

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

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

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

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 ...

Americans were bracing Thursday for frigid temperatures that forecasters said could produce life-threatening conditions, with ...

Studies show a fast-warming Arctic is partly to blame for the increasing frequency of the polar vortex extending its icy grip ...

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