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Record Heat Wave Strikes July 4 Celebrations Across US

Record triple-digit temperatures forced cancellations, strained the power grid and left more than 100 people treated for heat illness in Pennsylvania.

  • A brutal heat wave affecting nearly 160 million people from Mississippi to Maine disrupted Fourth of July festivities on Friday, forcing widespread event cancellations across 30 states with temperatures soaring up to 115 degrees Fahrenheit.
  • The National Weather Service issued excessive heat warnings as extreme humidity and record-breaking temperatures threatened dozens of local records across the central and eastern United States.
  • In Washington, D.C., officials temporarily closed The Great American State Fair on Friday, while Philadelphia's Salute to Independence Parade faced delays and more than 100 people in Pennsylvania were treated for heat-related illnesses.
  • Power grids faced heavy strain from surging air-conditioning demand, while New York City Mayor Zohran Mamdani urged residents to stay hydrated and indoors, warning that young children under 2 lack fully developed sweating abilities.
  • Author Jeff Goodell, who wrote "The Heat Will Kill You First: Life and Death on a Scorched Planet," said scientists have warned about this climate future for 50 years, attributing extreme temperatures to rising CO2 levels.
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The National Desk broke the news on Friday, July 3, 2026.
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