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

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

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The polar vortex could be reversing in a sudden stratospheric warming event, with the potential to send Arctic air and storms to the central and eastern U.S.

The main polar vortex is a circulation of air enveloping a near-permanent area of low pressure that exists in the upper atmosphere, above typical cruising altitudes for commercial jetliners, over ...

The polar vortex can bring bitter cold and winter weather to areas that do not normally get it.

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