From Brooklyn to the Bronx: How long will the NYC heatwave last and who’s most at risk?

US Heatwave News: A rare and dangerous heatwave is sweeping across the United States, pushing temperatures into the triple digits across major cities from the Midwest to the East Coast. Over 200 million Americans are under heat alerts, with no sign of relief in the coming days. As temperatures soar to record-breaking levels, public health officials are urging people to take protective measures. This guide outlines key updates, city-by-city forecasts, and crucial advice to stay safe through what could be the hottest week of the year so far.