Multiple cities from New York to Boston are shortening or canceling Fourth of July events, Amtrak has canceled some Boston‑to‑Washington routes, and Orange County authorities reported several Junior Reserve Officers' Training Corps cadets suffered heat illnesses after a bus lost air conditioning.The National Weather Service extended extreme heat warnings across the Midwest and East as a heat dome raises highs to near or above 100°F and heat indices toward 115°F, prompting cooling centers, altered event schedules, and warnings about power‑grid strain.New York Mayor
Zohran Mamdani urged setting air conditioners to 78°F to conserve energy, drawing criticism from Florida Governor
Ron DeSantis, while
Columbia University researcher
Jeff Schlegelmilch connected the prolonged heat to climate trends and businesses report surging demand for ice and repairs.