The main reason for the polar vortex to slow down is disturbances from the surface. Weather over the Amundsen Sea near Antarctica in the South Pacific is an important source of these disturbances.

On Wednesday, Chicago will be colder than parts of Antarctica, Alaska and the North Pole. The Windy City's "high" temperature on Wednesday should be around 10 below zero, while the overnight low ...

“These events never happen over the Antarctic,” says Aditi Sheshadri, an atmospheric scientist at Stanford University. And the absence of these polar vortex disturbances in the Southern ...

A polar vortex encircles the South Pole as well. The South Pole’s vortex, however, differs from its northern cousin. The southern hemisphere has less land and fewer mountain ranges near the pole ...

Earlier this July, the temperature more than 20 kilometres above the east Antarctic coastline suddenly warmed by about 50 degrees Celsius in a week — an event called a sudden stratospheric ...

We have to turn to the good, old polar vortex for the answer ... This means there’s one located at the South Pole and the North Pole—in fact, it’s usually much stronger at the South Pole!

A second polar vortex swirls over Antarctica. Typically that cold air is contained by a fast moving current of air known as the jet stream. The speed of that current is typically propelled by the ...

However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...