Fourth of July weather update: Millions across the eastern United States face dangerous heat this Fourth of July weekend, with temperatures potentially reaching 115 degrees Fahrenheit due to a heat dome. Forecasters warn of record-breaking highs and little overnight relief, impacting celebrations. Meanwhile, the West anticipates milder weather. Health experts urge caution during outdoor events as extreme heat poses significant risks.

A prolonged, dangerous heat wave will continue to intensify across most of the central to eastern U.S. into the Fourth of July weekend.

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Temperatures are expected to top 100 degrees over the coming days, as high pressure traps the scorching temperatures in a heat dome.

High humidity is expected to make conditions feel even hotter