More than 45 million people across the western U.S. are under heat alerts, with significant risks of heat-related illnesses, especially for vulnerable populations such as the elderly and those with pre-existing health conditions. The extreme heat is also exacerbating wildfire risks, with red flag warnings in effect for parts of Montana, Utah, Nevada, and the Dakotas. In Spokane County, Washington, a fast-moving wildfire has threatened 4,000 structures, prompting evacuations. Additionally, the East Coast faces elevated flash flood risks, with rainfall totals of 1-2 inches and isolated amounts up to 4 inches expected in some areas.