A blast of Arctic-chilled air from the polar vortex has reached the US as temperatures drop to as low as -46C (-50F) in Chicago. Cities in the midwest opened warming shelters as temperatures plummeted well below zero. 'This storm poses a serious threat to the wellbeing of people around the state, and we will use every tool at our disposal to keep our residents safe,' said the Illinois governor, JB Pritzker, in a statement on Tuesday.
The freezing weather was caused by the polar vortex, a mass of freezing air that normally spins around the north pole. But this time it made its way south in the US.
Continue reading...from World news | The Guardian http://bit.ly/2SeH8jP


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