ORANGE COUNTY — A warning of excessive heat was in force today in Orange County’s inland areas, with temperatures ranging from 94 to 104 in the region.

“The combination of strong high pressure and weak onshore flow will continue to produce dangerously hot temperatures across the region through at least the end of the week and possibly into the labor day weekend,” according to a National Weather Service statement, which predicted more heat records a day after a few were set.

The excessive heat warning will be in effect until 10 p.m. Friday in the Orange County inland areas, including the cities of Santa Ana, Anaheim, Garden Grove, Orange, Fullerton, and Mission Viejo.

The high temperature in Anaheim is forecast at 96 today and Thursday, 98 on Friday, 95 on Saturday, 94 on Sunday, 92 on Monday and 91 on Tuesday.

The California Independent System Operator, which manages the state’s electric grid, Tuesday issued a statewide Flex Alert, calling for voluntary electricity conservation from 2 to 9 p.m.

Forecasters again warned area residents to protect themselves and those close to them from the high heat. Their recommendations include avoiding strenuous work in high heat, wearing lightweight and light-colored clothing, staying well-hydrated, checking on friends and relatives, especially the elderly, and never leaving children, seniors or pets in parked cars since vehicle interiors can rapidly turn deadly hot.

Sunny skies were forecast in Orange County, along with highs of 76 in Newport Beach and Laguna Beach; 77 in San Clemente; 94 in Irvine; 96 in Anaheim; 97 in Fullerton and Mission Viejo; and 100 in Yorba Linda.

Little change is expected in Orange County temperatures over the next several days, although a slight temperature increase is expected starting Friday, lasting three days in some communities.