Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

The first cold wave will reach the East Coast on Thursday, followed by another surge of frigid air this weekend and more next ...

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

Cold temperatures are expected to last through the end of the month — and forecasters say that there's a potential for snow ...

The polar jet stream, which is affected by the polar vortex above it, has become quite wavy, allowing Arctic air to ...

Severe winter chill is expected to plunge central and eastern states into below average temperatures as the polar vortex ...

A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map ...

Moreover, the latest data suggests that the Polar Vortex is on the verge of a significant disruption due to a new SSW event. The disruption is expected to lead to a colder pattern across the United ...

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

The Polar vortex is causing temperatures to plummet dangerously across the Philadelphia region, and frostbite could become a ...

This coming weekend, the central and eastern United States will receive a blast of Arctic air, which will also affect ...

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