Polar vortex: -46C temperatures turn Chicago River to ice

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A blast of Arctic air from the polar vortex has caused temperatures to drop to as low as -46C (-50F) in Chicago. Cities in the midwest opened warming shelters as temperatures plummeted well below zero. The Illinois governor warned the weather ‘poses a serious threat’ to people’s wellbeing. The polar vortex, a mass of freezing air, usually spins around the North Pole
Polar vortex blasts US with life-threatening cold

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