The polar vortex is coming back. After a half-month hiatus, frigid air will again surge across the United States beginning this weekend through next week, as the unusually cold blob of air dips ...

The polar vortex can't be felt in the United States or anywhere on Earth. Brutally cold temperatures are heading to the Midwest and Northeast this week -- but don't mistake this for a polar vortex ...

Two newly identified patterns in the stratospheric polar vortex can send cold air over North America to cause extreme cold snaps, but the parts of the country that suffer differ between them. Those ...

During the first week of January 2014, the polar jet stream was kinked enough to allow a lobe of the polar vortex to slip further south into Canada displacing arctic air down into the United States.

A polar vortex collapse occurs when the layer between 10 and 50km above Earth’s surface warms up to 50 degrees in just two days - known as sudden stratospheric warming (SSW).

This is because the polar vortex has stretched and sent cold air south into the United States ten times this season. Typically, this might happen only once, maybe two or three times in a normal ...

Computer forecast models say that the polar vortex is likely to stretch again, sending cold air south somewhere and probably to the United States, around March 5, Cohen said.

One thing is sure, the phrase "polar vortex" has captured public attention and is now often misused to describe short-term bouts of frigid weather, experts told USA TODAY.

The polar vortex is coming back. After a half-month hiatus, frigid air will again surge across the United States beginning this weekend through next week, as the unusually cold blob of air dips ...

Computer forecast models say that the polar vortex is likely to stretch again, sending cold air south somewhere and probably to the United States, around March 5, Cohen said.

Computer forecast models say that the polar vortex is likely to stretch again, sending cold air south somewhere and probably to the United States, around March 5, Cohen said.