A 'heat dome' is set swallow the US today as the scorching temperatures soar above triple figures - with the 'dangerous' heatwave hitting highs of 118F. More than 265million people will be at risk, with a third of the American population being issued with excessive heat warnings. Rising temperatures across the country have caused Boston to declare a 'heat emergency' while New York City officials are urging residents to stay inside for their own safety.
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