It spread from the El Dorado Ranch Park north, onto the Yucaipa Ridge. The El Dorado fire has since burned 2,990 hectares (7,386 acres) and is now just 7 percent contained.
"Existing fires are displaying extreme fire behavior, new fire starts are likely, weather conditions are worsening, and we simply do not have enough resources to fully fight and contain every fire".
Cal Fire said 14,800 firefighters were battling 23 major fires in the state right now.
Officials expanded evacuation orders Monday for rural communities in the path of a huge fire in California's Sierra National Forest.
Local officials say a pyrotechnic device used to release blue or pink smoke to announce the gender of an expected baby sparked the blaze, which at the moment of writing has burned 7,050 acres of land in southern California. Cal Fire began tracking the numbers in 1987. This is due to dry vegetation and steep terrain, as well as the ongoing heatwave. No homes have burned and no injuries reported.
The fire prompted evacuations in parts of Yucaipa, a city of 54,000, and the surrounding area.
Serena Williams keeps title hopes alive with battling victory over Sloane Stephens
Williams had a nightmare start in the opening set as she made an uncharacteristic 13 unforced errors as Stephens took the set 6-2. Neither player is seeded, but Cornet has one of the strongest records against Williams (3-4) of any woman to play her that much.
On Monday night, a military helicopter tried but failed to land near Lake Edison to rescue people trapped by the fire, the Fresno Fire Department said on Twitter.
The wildfire dubbed the Creek Fire has charred more than 295 square kilometres of timber since breaking out Friday.
California has been baking under scorching conditions with temperatures reaching a record 121 degrees Fahrenheit (49 Celsius) on Sunday in Woodland Hills, an all-time high for Los Angeles county, the National Weather Service said. The California Independent System Operator that manages the state's power grid warned that up to 3 million people could lose power Sunday if the if residents didn't curtail their electricity usage. The heat had driven up power use in the state.
Nearly 12,000 lightning strikes started the blazes in California during a massive heatwave in mid-August.
With the hot and dry conditions, California has suffered a particularly busy fire season this year, with more than 1.6 million acres destroyed so far, including in three of the biggest blazes in the state's history.
California has seen 900 wildfires since August 15, many of them started by an intense series of thousands of lightning strikes.
A fire in the Japatul Valley southeast of Alpine has burned more than 9,850 acres and destroyed at least 11 structures in addition to 25 outbuildings.