The Arctic Oscillation is a metric used to describe the strength of the polar vortex, or mass of arctic air that rotates ...

As winter progresses, an active weather pattern has contributed to highly variable temperatures and precipitation across much of the country. From powerful atmospheric rivers to sharp temperature ...

The world's biggest iceberg has turned bright blue, as scientists warn this transformation heralds its imminent ...

Floridians woke up on December 30, 2025, to a sight few expected, frost on windshields and visible breath in the air. In ...

Warm air that has been hanging over the Midwest is about to be replaced by a blast of Arctic wind. Forecast models show a ...

Colder air is returning to the central and eastern U.S. as the polar vortex becomes more active, bringing fluctuating ...

Don't let the incoming string of relatively warm days in the greater Philadelphia region fool you; the polar vortex is still around.

A 2025 satellite image shows a series of ghostly ice swirls sculpted on the surface of Lake Michigan by strong winds during ...

The coldest air of the early winter season is blasting the eastern U.S. on Monday with single-digit temperatures with the wind chill, as the Polar Vortex unravels and, with it, brings dangerous arctic ...

It is now likely that the coldest period of sustained cold weather is behind us after gripping the Eastern U.S. for the first part of December. Warmer temperatures are expected for Christmas and into ...