The US National Weather Service on Tuesday said southwest US continued to experience extreme heat, with temperatures expected to surpass 120 degrees Fahrenheit.
The hot weather is expected to spread across western and south-central US by mid-August, agency said.
Meanwhile, the region stretching from the northern Plains into the upper Midwest could potentially face severe thunderstorms, severe wind gusts and large hail on Tuesday, while heavy rainfall is possible in eastern US.
The NWS early Tuesday issued a red flag warning for Colorado's Rangely, Meeker, Kremmling, Craig, Aspen, Vail, Cortez, Durango, and Rifle. Xcel Energy (XEL) and Black Hills (BKH) unit Black Hills Energy are the primary electricity service providers in the state.
A similar warning was raised for Utah's Duchesne, Price and Green River, which mostly fall under the service area of PacifiCorp's Rocky Mountain Power.
Also placed under a red flag warning were Oregon's Sutherlin, Roseburg, Canyonville, Shady Cove, Grants Pass, Medford, Ashland, Cave Junction, and parts of Corbett and Hood River; and areas near Vancouver in Washington. These places are primarily served by PacifiCorp's Pacific Power.
In California, a red flag warning was issued for Happy Camp, Mount Shasta, and Fort Jones. Meanwhile, an extreme heat warning was raised for Blythe, El Centro Imperial, Palm Springs, Twentynine Palms, Barstow, Baker, Death Valley, Bishop, Ridgecrest, Edwards AFB, Frazier Park, Mount Laguna, Julian, Borrego Springs, Beaumont, Indio, Victorville, Palmdale, Tehachapi, and parts of Santa Barbara and Santa Maria.
Pacific Power, PG&E (PCG) subsidiary Pacific Gas and Electric, Edison International's (EIX) Southern California Edison, and Sempra Energy (SRE) unit San Diego Gas & Electric are the major electricity service providers in these places.
The NWS also issued an extreme heat warning for Tonopah, Beatty, Las Vegas, and Caliente in Nevada, which falls under the service area of Berkshire Hathaway Energy unit NV Energy.
Affected areas in Arizona included Parker, Kingman, Lake Havasu City, Yuma, Bullhead City, Gila Bend, Phoenix, Wickenburg, Dateland, Casa Grande, Page, and Grand Canyon Village. These places are primarily served by Pinnacle West Capital (PNW) unit Arizona Public Service Company, and UNS Energy subsidiary Unisource.
A flood warning was raised for George West in Texas, served by American Electric Power's (AEP) Texas unit.