Meteorologist Sven Sundgaard predicted this wacky winter weather back in October, and he explains what's happening now and ...

The polar vortex is showing serious signs of weakening and could soon split or collapse spreading freezing weather southward ...

The biggest swings in the jet stream are associated with the most energy. Under the right conditions, that energy can bounce ...

Watch as a massive bowl of Arctic air is set to bring extreme, potentially record-breaking cold temperatures to parts of the ...

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States. This week, ...

The polar vortex, a mass of frigid Arctic air, pushed southward, causing temperatures around Niagara Falls to drop drastically. This sudden chill led to an extraordinary phenomenon: the mist from the ...

This winter, the Northern Hemisphere has been suffering from extreme cold. In South Korea, an unusually prolonged cold wave ...

A crippling winter storm that could paralyze parts of the Southern and Central U.S. this weekend, and some of the effects ...

Scientists are closely monitoring changes in the polar vortex and what they could mean for Earth over the next decade. Shifts ...

A crippling winter storm that could paralyze parts of the Southern and Central U.S. this weekend, and some of the effects ...

What travelers should know as a polar vortex heads towards the United States, including how airlines and hotels are responding, and experts on whether you should cancel your trip.

Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.