It's a term you hear every couple of winters, when we get stuck in the coldest of cold patterns – polar vortex. But what exactly is it?

A polar vortex is bringing arctic air into the country next week. Forecast maps show when freezing temperatures will sweep ...

While compound extreme events across the bulk of the planet are characterized by hot and dry conditions, those over polar ice ...

A cold snap across much of the U.S. in January could send energy prices soaring at a time when many Americans are struggling ...

Bitter cold sweeping across the majority of the US could bring storms that result in power outages and ‘significant’ travel ...

The polar vortex will bring Arctic air across ... said that it is expected to create a surge in demand for heating, and warned cold air in the Southeast could result in rolling blackouts and ...