The United States is bracing for a dangerous heat wave as a heat dome settles over the East and Midwest regions, bringing scorching temperatures that could reach triple digits in some areas. Forecasters predict oppressive conditions characterized by high humidity and heat indices exceeding 100 degrees in several states. Areas across the Midwest and Eastern U.S. are particularly at risk, with alerts issued for extreme heat from late June into early July. Residents are advised to prepare for prolonged periods of heat and to stay hydrated and indoors during peak hours. As the holiday weekend approaches, the National Weather Service has issued multiple alerts, warning of potential impacts on outdoor activities during the Fourth of July celebrations.