The heat dome is expected to cause widespread impacts, including extreme heat, increased wildfire activity, and deteriorating air quality. Communities in the Southwest, Northwest, and interior California may experience their hottest weather of the year. Wildfire risks are elevated in regions such as the Sierras, Great Basin, and southern California's mountains. Toxic smoke from fires could worsen air quality, particularly in the Northwest and Northeast. Vulnerable populations, including the elderly and those with respiratory conditions, are at heightened risk due to the extreme heat and poor air quality.