Winter cold extremes linked to high-altitude polar vortex weakening - A new study finds that these weak states have become more persistent over past four decades and can be linked to cold winters in Russia and Europe, supporting that a changing Arctic impacts weather across the Northern Hemisphere.

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Winter cold extremes linked to high-altitude polar vortex weakening - A new study finds that these weak states have become more persistent over past four decades and can be linked to cold winters in Russia and Europe, supporting that a changing Arctic impacts weather across the Northern Hemisphere.