The US National Weather Service said portions of the central and eastern US could encounter heavy showers and storms through the end of the workweek due to a series of fronts.
Persistent dangerous to extreme heat conditions are forecast for Southwest US, with the conditions expected to expand eastward over the weekend into early next week, the agency said.
The Great Basin continues to face elevated fire risks continues, while poor air quality lingers across the Northwest.
The NWS early Wednesday issued a red flag warning for Colorado's Kremmling, Aspen, Vail, Rifle, Buena Vista, Gunnison, Lake City, and Grand Junction. 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 Oregon's Sutherlin, Roseburg, Canyonville, Shady Cove, Grants Pass, Medford, Ashland, and Cave Junction, primarily served by PacifiCorp's Pacific Power.
Also placed under a red flag warning were California's Happy Camp, Mount Shasta, and Fort Jones. Meanwhile, an extreme heat warning was raised for Blythe, El Centro Imperial, Palm Springs, Palmdale, Twentynine Palms, Mount Laguna, Julian, Borrego Springs, Beaumont, Indio, Victorville, Barstow, Baker, Death Valley, Bishop, Tehachapi, Ridgecrest, Edwards AFB, Frazier Park, 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.
An extreme heat warning was also raised for Tonopah, Beatty, Las Vegas, and Caliente in Nevada, which falls under the service area of Berkshire Hathaway Energy unit NV Energy.
In Arizona, affected areas 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.
The NWS also issued a flash flood warning for small pockets near Omaha bordering Iowa and Nebraska.