A strengthening heat dome over the interior United States will drive dangerous temperatures through Monday, exposing a substantial share of the population to high heat.
The heaviest 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 slow cool fronts and carry record-breaking conditions deep into next week.
Residents are urged to stay hydrated, limit outdoor activity during peak hours, and look in on neighbors as the stretch of sweltering heat settles across part of the nation's interior.