"A polar vortex happens when air in the Arctic is destabilized, often by intruding warming air currents, and moves extreme cold air southward. The type of polar vortex this current system could become is known as a "sudden stratospheric warming" event - if it indeed comes to pass, this would be the earliest instance of it happening during a winter season on record."
"The polar vortex will likely hit parts of western and central Canada, and could later move on to eastern parts of the country as well. It's also expected to stretch over much of the U.S., "including northern parts of the Pacific Northwest, the Great Plains, parts of Texas, and the interior Mid-Atlantic," a social media post from the National Weather Service warned."
A polar vortex occurs when Arctic air is destabilized, often by intruding warming air currents, sending extreme cold southward. A current system may evolve into a sudden stratospheric warming event and would be the earliest such winter occurrence on record if realized. The system is likely to impact western and central Canada and could later extend eastward, stretching over much of the United States including the Pacific Northwest, the Great Plains, parts of Texas, and the interior Mid-Atlantic. Below-normal temperatures may begin around November 25 with confidence increasing November 26–30. The cold snap could cause unusual New England snowfall and widespread travel disruptions during Thanksgiving.
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