A tightening heat dome over the mid-section United States will drive oppressive temperatures through Monday, exposing a substantial share of the population to high heat.
The deepest dome is forming over the Rockies and Plains, while heat advisories persist for portions of southern Colorado and several Midwestern states.
Thunderstorms may pop up in scattered areas but will offer little relief from the stifling heat.
Forecasters warn the dome's intensity will hold off cool fronts and sustain record-breaking conditions deep into next week.
Residents are urged to keep water handy, limit outdoor effort during peak hours, and look in on neighbors as the stretch of extreme heat spreads across the nation's midsection.