A “powerful” blast of Arctic cold has swept across the northeastern United States and parts of Canada, threatening record low temperatures over the weekend.The National Weather Service in the US warned on Friday that the “impressive” cold front would plunge temperatures 15 to 35 degrees below average on the Fahrenheit scale (7 to 17 Celsius) across a broad swathe of the country, from the Upper Mississippi Valley to New England.“Even though it’s a short-lived blast, conditions will be extremely dangerous,” it said in an advisory.
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