The displaced polar vortex will bring prolonged periods of cold to the eastern portion of the Lower 48 through the end of ...

When parts of the vortex break down, lobes of Arctic air can drift south, guided by changes in the jet stream. This allows ...

A fierce Arctic blast of bitterly cold air is poised to overtake much of the central, eastern and southern U.S. over the next ...

Three separate rounds of Arctic air have already swept across the central and eastern United States through mid-December, ...

A long-awaited blast of cold air, courtesy of the polar vortex, will overtake much of the US, but the forecast says the low ...

An arctic air mass has descended into the US, and a disrupted polar vortex will keep the nation in the freezer at times deeper into December. More than 200 million people will wake up to freezing ...

The polar vortex is expected to send three waves of Arctic air into the U.S. through mid-December. Despite the cold blasts, current forecasts do not predict significant snow for most of Mississippi.

Boston has seen just one day so far this month where the average temperature was above the seasonal norm, daring me to ask — are you over the cold yet? Astronomical winter hasn’t even arrived (that ...

Frigid temperatures are expected to impact much of the central and eastern United States in the coming weeks. The first of three polar vortex systems is expected this month, according to AccuWeather.

Just a few days into December, an arctic air mass has swept into the United States, bringing subzero morning lows and daytime highs stuck in the teens for 30 million Americans in the Northern Plains, ...

Ready for some serious cold? The planet's most extreme cold air will be barreling into the central and eastern United States this coming weekend "like a wrecking ball," said Weather Trader ...

Ready for another round of chilly Christmas weather? Florida may get hit with two or more cold waves this week thanks to a polar vortex system, AccuWeather forecasters say. "We believe that two to ...