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Polar vortex: -46C temperatures as Chicago River turns to ice
A blast of Arctic air from the polar vortex has meant temperatures (with wind chill) are set 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
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