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

A strong, stable vortex is like a skater spinning with their arms tucked closely in, holding in an area of cold air over the Arctic. But when there’s a wobble in the rotation, winds in the vortex can ...

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

How the Polar Vortex Can Bring Arctic Blasts to the U.S. Vast weather patterns can carry blasts of frigid air far from the polar regions—here’s how it works ...

Europe may be in for another cold blast like the one that surprised forecasters and sent gas prices soaring last week, with the potential weakening of winds that keep frigid air confined to the Arctic ...

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

Up next: another visit from the polar vortex. An Arctic air mass plunges into the Lower 48 next week. This brings the potential for multiple nights with subzero wind chills in the Ohio Valley.

If you thought last week was cold, hold onto your hot lattes and be ready to bundle up as (another) winter storm is forecast to plunge arctic air deep into the Deep South by early next week.

6:21 What to expect on day one of Trump’s second Presidency Donald Trump will be sworn in as president in a different location this year — the U.S. Capitol building — as “bitterly” cold ...