A tightening heat dome over the nation's heartland United States will drive oppressive temperatures through Monday, exposing a wide share of the population to high heat.
The heaviest dome is setting up over the Rockies and Plains, while heat advisories continue for portions of southern Colorado and several Midwestern states.
Thunderstorms may develop in scattered areas but will do little relief from the blistering heat.
Forecasters warn the dome's intensity will slow cool fronts and carry record-breaking conditions well into next week.
Residents are urged to keep water handy, limit outdoor strenuous work during peak hours, and keep an eye on older relatives as the stretch of extreme heat spreads wider parts of the country's interior.