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

The atmosphere is a complicated place. Warm temperatures in one spot can contribute to brutally cold storms somewhere else.

The meteorologists said the polar vortex system is set up due north of Michigan over Canada's Hudson Bay. It's at least ...

Despite being notorious for bringing brutal cold and dangerous wind chills, the polar vortex has a surprising upside.

A winter storm descending on the US is expected to deliver heavy snow and ice to more than 150 million people across roughly ...

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest ...

Starting Thursday, dangerously frigid air from Siberia and the North Pole is forecast to plunge the Great Lakes region into ...

Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march across the eastern U.S.

What is polar vortex and how much snow is expected in US? A winter storm linked to polar vortex disruption has impacted ...

What is the polar vortex? Mississippi weekend weather forecast calls for winter storm with lows in the teens, paired with ...

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.

A vast pool of Arctic air is again spilling south, the kind of outbreak that can turn highways into morguish car lots and ...