But when the vortex in the stratosphere is disrupted—split, displaced, or elongated—it can push the jet stream below it south, bringing Arctic air into cities in the U.S., Europe, and Asia.

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Powerful winter storms which led to deaths and power outages in the UK and Ireland were made more likely by an intense swirling vortex of winds miles above the Arctic, say scientists.

A 'polar vortex collapse' is set to plunge the United States back into the frigid weather much of the country suffered through in February. This weather phenomenon is expected to bring more winter ...

At least 10 of these stretched polar vortex events have occurred this winter, including the ongoing event, according to Cohen: four in December, four in January and two in February.

Winter, which is warming faster than any other season for much of the US, seems to be making a comeback for the first time in years; this January was the coldest in the Lower 48 since 1988.