As the Fourth of July approaches, a dangerous heat wave is intensifying across the eastern United States, with temperatures expected to soar above 100 degrees in regions from Washington, D.C. to Boston. Millions of Americans are under extreme heat alerts, as excessive heat warnings have been issued for at least 36 states. The soaring temperatures are expected to break records, making this holiday one of the hottest on record, with forecasts indicating hazardous conditions. Cities like New York and Philadelphia are bracing for oppressive heat, with high humidity exacerbating the situation. Authorities are urging residents to take precautions, as the heat dome threatens to last through the holiday weekend, prompting delays and event cancellations nationwide.