An extreme cold wave from the Arctic is threatening the United States. Historically low temperatures could affect several regions, according to weather forecasts. This cold wave, fueled by large ...

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

It acts as a barrier between the midlatitudes and the poles. However, at times the polar vortex can break down and send that arctic air farther south into Asia, Europe, and North America.

When the polar vortex weakens, the jet stream can break off its usual path and cause colder air to push south, according to NOAA. Temperatures could hit single digits in much of the northeast ...

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

A blast of arctic air from Canada has brought the season's coldest weather to most of the United States. The system, known as a polar vortex, is forecast to bring subzero temperatures to the ...