A powerful heat wave unsettled Fourth of July festivities across large swaths of the central and eastern United States on Friday, prompting officials to cancel or delay dozens of parades, concerts and fireworks displays as the country observed its 250th anniversary.
Among the events affected was the Great American State Fair on the National Mall in Washington - a focal point of President Donald Trump's efforts to mark the nation's 250th birthday. Organizers temporarily closed the fair on Friday afternoon when temperatures reached 101 degrees Fahrenheit (38 degrees Celsius). They said the fair was expected to reopen at 5 p.m., weather permitting, and that operations would include adjustments such as cooling tents and misting stations to protect attendees.
Forecasters said record-breaking heat that began in the Midwest earlier in the week had spread eastward. The National Weather Service reported that over 185 million people were under heat alerts on Friday, and that peak heat indices could reach as high as 115 degrees Fahrenheit (46 degrees Celsius) in many locations. Officials and meteorologists warned the heat wave could be fatal and urged people celebrating outdoors to stay hydrated, seek shade and monitor for symptoms of heat-related illness.
Event cancellations and postponements were recorded in at least seven states. Notable disruptions included the cancellation of a major Independence Day parade in Philadelphia and the calling off of events in Maryland's Takoma Park and in Loudoun County, Virginia. Local authorities cited the extreme temperatures and public safety risks as the reasons for the decisions.
The combination of widespread heat alerts and concrete public-safety measures highlighted the challenge that intense, sustained heat posed to large public gatherings on a national holiday. Organizers that remained open announced mitigations aimed at reducing heat exposure, while officials continued to advise caution for anyone outdoors for prolonged periods.
Context and next steps
Officials said that reopening plans for temporarily suspended events would depend on evolving weather conditions. Where events proceeded, organizers planned to deploy cooling infrastructure and encourage preventative health measures among attendees.