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Polar vortex is 'spinning backwards' above Arctic after major reversal event
https://www.space.com/earth-polar-vortex-spinning-backwards-above-arctic-reversal-event
Earlier this month, a sudden atmospheric warming event caused the Arctic's polar vortex to reverse its trajectory. The swirling ring of cold air is now spinning in the wrong direction, which has triggered a record-breaking "ozone spike" and could impact global weather patterns.