The United States is bracing for a significant shift in weather patterns as the heat dome, which previously dominated the western U.S., moves eastward. This migration will bring much-needed relief to the West Coast, but it also heralds the arrival of a major heatwave across the central, eastern, and southeastern regions of the country. Temperatures are expected to climb well above the seasonal averages for this time of year, primarily due to the heat dome, a strong high-pressure system that traps hot air, causing unusually high temperatures.