A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the ...

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

It's like "bomb cyclone" or "firenado." It seems like the sort of phenomenon that would be responsible for the ...

How the Polar Vortex Can Bring Arctic Blasts to the U.S. Vast weather patterns can carry blasts of frigid air far from the ...

These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary ...

Scientists are scrambling to understand how climate change may be interfering with the winds that carry our weather, with ...

The unseasonable chill that has swept through the eastern half of the US defies last year's mild winters and the South's ...

WASHINGTON — Get ready for extreme cold weather in D.C. and most of the U.S. over the next few days. The polar vortex has ...

When the vortex is stable, the polar jet stream shifts northward, helping to keep the coldest air within the Arctic. However, when this stable scenario breaks down, it can mean an intense cold ...

In Earth's upper atmosphere, a fast-moving band of air called the jet stream blows with winds of more than 275 miles (442 km) ...

But here’s where things get interesting: the polar vortex’s behavior is closely tied to the jet stream, a fast-moving river of air that flows high above the Earth. The jet stream acts like a ...