The "heat dome" that's been hovering over Texas has expanded to California, Nevada, and Arizona, bringing with it a heat wave that's expected to break records across the West, NBC News reports.
The National Weather Service says one-third of Americans were under excessive heat warnings, watches, or advisories over the weekend.
The oppressive heat was expected to peak on Sunday in those states, with some desert temperatures forecast to climb close to 130 degrees Fahrenheit.
Las Vegas could reach a high of 117 degrees on Sunday, tying the city's all-time record.
The heat wave there has already sent people to hospitals.
An emergency room doctor reported treating dehydrated tourists, as well as a passed-out elderly resident who kept his thermostat at 80 degrees to keep down electricity costs.
Local health officials have seen at least seven heat-related deaths this year.
In nearby Death Valley, Calif., one of the hottest places on Earth, the temperature had reached 128 degrees on Sunday, surpassing the daily record by a single degree.
In west Texas, an extreme heat advisory remained in effect at Big Bend National Park.
Hikers should be OFF TRAILS in the afternoon."
Phoenix hit 118 degrees on Saturday, breaking the daily temperature high record by one degree.
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