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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Polar vortex blasts US with life-threatening cold ► https://www.theguardian.com/us-news/2019/jan/29/polar-vortex-cold-us-midwest-east-snow

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