Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.

Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of ...

The first cold wave will reach the East Coast on Thursday, followed by another surge of frigid air this weekend and more next ...

A crippling winter storm that could paralyze parts of the Southern and Central U.S. this weekend, and some of the effects ...

Forecasters are warning that virtually the entire United States is about to be engulfed in a deep freeze, as a distorted ...

A Polar vortex has covered the Philadelphia region under a canopy of frigid temperatures, but many people may not realize what a Polar vortex actually is, and the dangers — like frostbite — such ...

What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in ...

The polar vortex has broken, and severe temperatures are set to dominate most of the country in the coming days. Temperatures in the 10s are forecast for much of the Northeast, and subzero ...

A polar vortex is bringing another round of frigid, Arctic air to the Eastern United States. Temperatures across Tennessee are expected to drop into the low 20s and upper teens over the weekend. There ...

The wall that keeps cold air contained in the Arctic is called the polar vortex. There's been a "displacement" in the polar vortex, which allows Arctic air to escape to the south. An "arctic frontal ...

The big winter (and popular) topic is dusted off very early this season as frigid air plunges south next weekend. But what is ...