The heat wave is expected to affect millions across the Eastern U.S., particularly in urban areas like New York City and North Jersey. High temperatures combined with elevated humidity levels could lead to heat-related illnesses, especially for vulnerable populations such as the elderly, young children, and those with pre-existing health conditions. The oppressive heat may also strain energy resources as residents turn to air conditioning to stay cool. Outdoor activities could become hazardous during peak heat hours, and the risk of dehydration and heat exhaustion will be heightened. Residents are advised to take precautions to mitigate these risks.