A building heat dome over the interior United States will drive brutal temperatures through Monday, exposing a substantial share of the population to high heat.
The strongest dome is forming over the Rockies and Plains, while heat advisories continue for portions of southern Colorado and several Midwestern states.
Thunderstorms may spark up in scattered areas but will offer scant relief from the stifling heat.
Forecasters warn the dome's intensity will stall cool fronts and push record-breaking conditions deep into next week.
Residents are urged to keep water handy, limit outdoor activity during peak hours, and watch out for vulnerable neighbors as the stretch of extreme heat settles across part of the nation's midsection.