The United States is bracing for a dangerous heat wave that is set to impact over 230 million people as temperatures soar to life-threatening levels. Cities including New York, Washington D.C., and Boston are preparing for record-breaking heat, with some areas expected to feel as hot as 111 degrees. A heat dome is predicted to smash previous temperature records, and thousands are under heat alerts as extreme humidity exacerbates the situation. Residents are advised to stay hydrated, seek cooling centers, and prepare for severe weather conditions. As the nation gears up for the July 4 festivities, officials are warning that this could be one of the hottest Independence Days ever recorded.