A prolonged, intense heat wave is expected to affect much of the central and eastern United States leading into and through the July 4 holiday weekend. Multiple outlets report that temperatures will climb into the 90s and 100s Fahrenheit, with humidity raising “heat index” values well above actual air temperatures. Scientific American says the conditions could make it feel as hot as about 115°F in parts of the eastern U.S. The New York Times frames the event as dangerous heat spreading through the U.S. during the July 4 weekend, while NBC and Times of India specify timing and geography, describing the heat as starting around midweek (including Tuesday) and continuing through July 4. Times of India adds that overnight temperatures are expected to remain high, with overnight lows offering limited relief, which can increase the risk of heat-related illnesses. Collectively, the reports emphasize the duration of the heat, the role of humidity in intensifying perceived temperatures, and the heightened health risk during daytime and nighttime hours.