Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all ...

The North Pole is surrounded by a massive circular upper-air weather phenomenon in the Arctic called the polar vortex. It is ...

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

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

Arctic winds grip the US Midwest, fuelling record cold and viral claims of ‘exploding’ trees. Experts explain frost cracking ...

Behind the historic winter storm that blasted 40 states this weekend, a dome of Arctic air associated with the polar vortex will bring days of life-threatening temperatures to much of the country, ...

The sudden blast may come as a shock to many Americans after a mostly mild start to winter, but that warmth may be partly ...

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

A polar vortex disturbance will drive a winter storm in Kentucky, with snow, frigid temps, and wind chills below zero ...