A heat dome produced temperatures of 101°F at the National Mall and heat indices up to 115°F, leading to the temporary closure of the Great American State Fair and dozens of canceled or postponed parades, concerts, and fireworks displays. More than 185 million people were under heat alerts according to the National Weather Service, with additional reports of travel disruptions and energy-grid strain on the East Coast. European health authorities separately linked thousands of excess deaths to record heat in that region.