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

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

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

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

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.

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