As the July Fourth holiday approaches, extreme heat is set to impact millions across the eastern United States. A significant heat wave, described as a heat dome, is causing temperatures to soar into dangerous territory, with several cities, including New York, Philadelphia, Boston, and Washington, D.C., experiencing some of the hottest conditions in over a decade. Heat records have already been shattered, and weather officials are urging residents to take precautions amid life-threatening temperatures. The extreme weather has also led to delays and schedule changes for holiday events, with forecasts predicting continued sweltering heat and potential storms. With more than half of Americans affected, preparations for safe celebrations are critical as the nation gears up for Independence Day festivities amid the scorching heat.