Polar vortex brings ‘dangerous cold’ to US
Much of North America was gripped by the coldest weather in decades as extreme conditions, caused by a polar vortex – a pattern of winds that traps cold air – spread east and south on Tuesday.
More---> http://www.ft.com/cms/s/0/a5c1b7e8-7...c0.html#slide0
Much of North America was gripped by the coldest weather in decades as extreme conditions, caused by a polar vortex – a pattern of winds that traps cold air – spread east and south on Tuesday.
More---> http://www.ft.com/cms/s/0/a5c1b7e8-7...c0.html#slide0
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