The US National Weather Service on Thursday forecast persistent dangerous and extreme heat in southern US until the weekend.
Meanwhile, a heatwave is expected to intensify in Southwest US this week, before peaking and spreading to the Intermountain West and northern High Plains over the weekend.
Heavy to excessive rainfall and significant flash flooding is forecast in parts of southern New England amid multiple thunderstorms.
The NWS issued an extreme heat warning early Thursday for Oklahoma's Bartlesville, Tulsa, Muskogee, Hugo, McAlester, and Oklahoma City. OGE Energy (OGE) subsidiary Oklahoma Gas & Electric and American Electric Power's (AEP) Public Service Co. of Oklahoma are the major service providers in Oklahoma.
A similar warning was raised for Arizona's Yuma, Parker, Lake Havasu City, Bullhead City, Kingman, Ajo, Gila Bend, Phoenix, Wickenburg, Dateland, Prescott, Payson, Globe, Casa Grande, Tucson, Globe, San Carlos, Oracle, Oro Valley, Green Valley, Nogales, Sierra Vista, Bisbee, Sells, Willcox, Benson, Safford, Bisbee, Page, and Grand Canyon Village.
Arizona is The state is primarily served by Pinnacle West Capital (PNW) unit Arizona Public Service Company, and UNS Energy subsidiaries Unisource and Tucson Electric Power.
Affected areas in California include Blythe, El Centro Imperial, Palm Springs, Twentynine Palms, Campo, El Cajon, Mount Laguna, Julian, Borrego Springs, Indio, Escondido, Temecula, San Clemente, San Bernardino, Hemet, Beaumont, Victorville, Barstow, Baker, Death Valley, Tehachapi, Bishop, Anaheim, Ontario, Chino, Los Angeles, Anaheim, Santa Ana, Burbank, Palmdale, Santa Clarita, Long Beach, Oxnard, Malibu, San Luis Obispo, Ridgecrest, Santa Maria, Paso Robles, Edwards AFB, and Riverside.
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.
Also placed under an extreme heat warning watch were Tonopah, Beatty, Las Vegas, and Caliente in Nevada, which falls under the service area of Berkshire Hathaway Energy unit NV Energy.
The NWS also issued an extreme heat warning for Utah's St. George, Zion National Park, Escalante, Capitol Reef National Park, and Hanksville. Meanwhile, a flash flood warning was issued for Ogden, Salt Lake City, Tooele, Provo, Duchesne, and parts of Zion National Park. PacifiCorp's Rocky Mountain Power is the major service provider in the state.
Flood warnings were raised for Cotulla and George West in Texas, served by AEP's Texas unit; and New York's Saratoga Springs, Albany, Hunter, served by National Grid (NGG) and Fortis (FTS) subsidiary Central Hudson Gas & Electric.