Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...

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

Here's the latest on the winter storm. A historic winter storm is poised to produce potentially record-breaking snows from ...

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

Extreme cold and snow smacked the Gulf Coast states this week, but the polar vortex may not be to blame.

With last week's freeze being the second time temperatures dipped below freezing this winter, many are wondering if this ...

The polar vortex is like a giant, swirling pool of super-cold air in the upper atmosphere over the North Pole ... air stays tightly locked around the arctic, keeping the freezing temperatures ...

which can also help force the jet stream to dive down south over the continental US and bring cold Arctic air with it, independent of the polar vortex," Butler and Ciasto wrote. A NOAA video ...

Part of Mississippi under extreme cold warning after winter storm dropped snow across the Gulf Coast. When will temperatures ...

The cold temperatures are coming from a not uncommon expansion in the Polar Vortex, which are counter-clockwise rotating air ...

The polar vortex is a gigantic circular upper ... as far away as the mid-latitudes can trigger an outbreak of arctic air over the United States weeks to months later. Unable to view our graphics?