Why is it so cold? Split in polar vortex brings historic deep freeze to US

Why is it so cold? Split in polar vortex brings historic deep freeze to USThe US is currently experiencing historically cold weather, with Chicago dropping to a low of around -23F (-30C) on Wednesday – but what is the cause of this extreme drop in temperature? A split in the polar vortex has been identified as the cause of the bitter cold that continued to sweep parts of the country on Thursday. The polar vortex is a mass of cold air that usually stays bottled up in the Arctic.




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