Much of the U.S. is being blasted by ice, snow and wind, as the polar vortex that dipped south over the weekend is maintaining its frigid grip.

In the stratosphere over Siberia, temperatures recently jumped nearly 100 degrees Fahrenheit, shoving the polar vortex off its North Pole perch.

The polar vortex is a massive, swirling band of cold air that normally traps frigid temperatures around the Arctic. However, recent scientific studies show this vortex is weakening, which could ...

This winter, with record snow in New Orleans and drought and destructive wildfires in Southern California, has not been normal.

The dynamics of the stratosphere, particularly the behaviour of the polar vortex, have emerged as a cornerstone in understanding mid‐latitude weather extremes and seasonal climate variability ...