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

The greater Philadelphia region will experience no weekend letup in the prolonged cold snap gripping the area.

In the coming weeks, cold air will continue for parts of the U.S. thanks to the influence of the polar vortex.

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

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

A gargantuan winter storm, aided by a deep surge of Arctic air, is forecast to affect over half of the population in the United States, delivering widespread hazardous weather, such as heavy snow and ...

A major ice storm is expected to impact multiple states from Texas to Georgia this weekend, ...

A polar vortex is settling over the eastern United States, and temperatures are expected to fall into the weekend, bringing winter weather with them.

The polar vortex will push Artic air south, and a severe winter storm could follow. How cold will it get in Louisiana?

A shift in the polar vortex has forecasters watching closely as the coldest air of the season approaches. Here's what to know ...

It exists all the time, but it usually gets stronger in winter. When the jet stream (a river of wind) bends and dips south, ...