WASHINGTON — Extreme heat, wildfire risk and the threat of severe storms have disrupted or reshaped July 4 outdoor celebrations across parts of the United States, highlighting how climate-related hazards are increasingly affecting one of the country's busiest holiday weekends.
A broad heat dome stretching across much of the central and eastern United States prompted officials to cancel, postpone or modify parades, concerts and fireworks events ahead of Independence Day, while local authorities in parts of the West imposed fireworks restrictions because of elevated wildfire danger. The disruptions come as millions of Americans gather outdoors during the nation's 250th anniversary celebrations.
The U.S. National Weather Service warned that more than 185 million people were under heat alerts on Friday, with heat index values reaching as high as 115 degrees Fahrenheit (46 degrees Celsius) in some areas. Forecasters urged people attending outdoor events to stay hydrated, seek shade, limit strenuous activity and watch for signs of heat-related illness.
In Washington, organizers temporarily closed the Great American State Fair on the National Mall because of dangerous temperatures before planning to reopen with additional cooling stations and misting areas. Other communities across several states canceled or delayed Independence Day events, including parades and fireworks displays, citing public safety concerns.
Meteorologists also warned that thunderstorms could interrupt fireworks displays across portions of the Northeast and Mid-Atlantic on Saturday evening, while areas of the Plains and Midwest faced additional risks from severe weather. In the western United States, prolonged drought, extreme heat and dry vegetation heightened wildfire concerns, leading some jurisdictions to prohibit consumer fireworks or strengthen fire restrictions.
Climate scientists said the prolonged heat has been intensified by long-term human-driven climate change acting on a naturally occurring heat dome. Researchers with the World Weather Attribution initiative said rising global temperatures have increased the likelihood and severity of the conditions affecting outdoor gatherings, sporting events and public infrastructure.
Environmental experts also warned that fireworks smoke could temporarily worsen air quality, particularly where hot, stagnant weather limits atmospheric mixing. People with asthma and other respiratory conditions were advised to monitor local air-quality alerts and reduce exposure if smoke concentrations increase.
Federal, state and local officials continued urging residents to monitor weather forecasts and follow public safety guidance as Independence Day events proceeded under heightened weather and environmental risks.
