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High above the Arctic, powerful winds usually circle the North Pole each winter, helping trap some of the coldest air on Earth.
But this circulation, known as the polar vortex, has weakened and shifted position in recent days.
While such disruptions can occur during winter, scientists say an event this early in November is unprecedented in modern observations.
Similar disruptions in past years have sometimes been followed by colder weather affecting parts of Europe and North America.
