The Pacific Northwest is expected to see up to seven inches of rain this week, as the eastern United States braces for arctic cold.

A shifting polar vortex will send multiple rounds of Arctic air into the central and eastern United States through the first ...

A chilling forecast looms over the East Coast, with a polar vortex promising a hellish winter storm next week.

Storms, some of which may bring snow, are expected to accompany a push of colder air this week, and the next storm is ...

WASHINGTON (AP) — The polar vortex hit its peak across much of America on Wednesday, with an icy grip that made Arctic Greenland seem like a toasty vacation spot in comparison. Even Mars has been ...

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.

Three rounds of Arctic air in the forecast ❄️ Snow and ice threat in the mid-Atlantic 🎄 White Christmas historical probabilities ...

A blast of Arctic air gripped much of the central and eastern portions of the U.S. on Friday in sub-freezing temperatures ...

Individuals experiencing homelessness in Washington, D.C., faced increased risk of hypothermia from freezing temperatures and extreme wind chill brought by last week’s polar vortex. The Arctic cold ...

Rain was falling across much of the area on Tuesday and was expected to taper off by mid-afternoon, forecasters said.

Boston saw overnight lows in the teens, hitting 13 degrees, tying a century-old record for coldest Dec. 5 morning.