A dangerous combination of extreme heat and humidity is gripping the eastern United States.
The National Weather Service warned that the heat index—how hot it actually feels—could climb to 115°F (46°C) in cities including Washington, Philadelphia and New York.
The scorching conditions arrive during the Fourth of July holiday.
President Donald Trump is set to host America’s 250th birthday celebration outdoors, and thousands of fans attend World Cup matches.
Officials are urging caution. “This level of rare and long-duration heat… affects anyone without effective cooling and adequate hydration,” the National Weather Service warned.
New York City Mayor Zohran Mamdani echoed the advice, urging residents to stay indoors whenever possible.
Heatwave Triggers Health Warnings
The intense heat is being fuelled by a stubborn “heat dome”—a high-pressure system trapping hot air over much of the eastern US.
Dry soil and ongoing drought conditions are making matters even worse by allowing the ground to heat up faster.
Meteorologists say heatwaves like this are becoming more frequent and intense as the climate warms.
Some relief is expected over the weekend as thunderstorms and cooler air gradually move into the region.
Nature doesn’t care about holiday plans—and sometimes the biggest fireworks come from the weather itself.
