The US National Weather Service said it expects flooding risks in portions of the central Plains into the Midwest, southern Arizona and New Mexico due to heavy to excessive rainfall from Monday through Thursday.
Meanwhile, most of east Texas into the lower and mid-Mississippi Valley is likely to face hot temperatures and high humidity through at least midweek.
The NWS issued a red flag warning for California's Shasta Dam, Redding, Red Bluff, Corning, Alder Springs, Paradise, Oroville, Marysville, and parts of Auburn. These places are primarily served by PacifiCorp's Pacific Power and PG&E (PCG) subsidiary Pacific Gas and Electric.
A similar warning was raised for Wyoming's Riverton, Lander, Rock Springs, Rawlins, Casper, Douglas, Muddy Gap, Baggs, Elk Mountain, Medicine Bow, Shirley Basin, Casper, Bill, Garrett, Glenrock, Chugwater, Glendo, Wheatland, Tottington, Lusk, Lance Creek, and Centennial.
Wyoming mostly falls under the service area of Rocky Mountain Power.
A flash flood warning was raised for Arizona's Grand Canyon Village, where Pinnacle West Capital (PNW) unit Arizona Public Service Company is the primary service provider.