The United States is preparing to celebrate its 250th Independence Day with concerts, parades, and fireworks. However, celebrations are shadowed by a severe heatwave, particularly along the East Coast. Temperatures in Philadelphia and Washington D.C. are forecast to exceed 38 degrees Celsius. Due to the extreme heat, the Independence Day parade in Washington D.C. has been cancelled. Authorities have issued evacuation orders for attendees, prioritizing public safety amid the dangerous conditions. The heatwave poses a significant risk to revelers, prompting officials to adjust planned events and urge caution.