Record-breaking heat is scorching the Western United States, with millions of people enduring stifling temperatures. A high-pressure air ridge is trapping hot air near the surface, leading to prolonged heatwaves. Cities like Las Vegas and Portland are experiencing unusually high temperatures, prompting officials to declare heat emergencies. The Pacific Northwest is particularly vulnerable, with deadly heat waves in recent years. Cooling centers have been opened, and measures are in place to protect vulnerable populations. Homeless individuals are especially at risk, seeking refuge in designated cooling centers. Even cities accustomed to high temperatures, such as Palm Springs and Phoenix, are struggling under the extreme heat. The situation is compounded by the risk of new wildfires due to the heat and winds. The Eastern half of the country is also experiencing dangerous heat and humidity. Forecasters predict the scorching temperatures will persist and spread towards the Plains states.