At least 23 people have been killed by the fires in Sonoma, Napa, Mendocino and Yuba counties, where 3,500 homes and businesses had been burned at last count.
Officials expect the death toll to rise when officers begin going into the “hot zones” that were immolated in the firestorm.
And officials even warned that some of the big fires could merge, even as new blazes erupted.
The killer wildfire raging in Northern California’s wine country has remained completely uncontained.
Evacuations continue, including one order covering the entire city of Calistoga in Napa County.
In Sonoma County, where the menacing arc of flames has done the most damage, Geyserville residents were urged to leave Wednesday morning – two hours later, another evacuated order was issued in Sonoma Valley.
California Fire Chief Ken Pimlott said: “This is a serious, critical, catastrophic event.”
The untamed blaze has exhausted crews as they struggle to keep the flames under control.
Mr Pimlott told the New York Times: “These fires are literally just burning faster than firefighters can run.
“We are attacking many, many new fires that we put out while they are still small.”
The Atlas Fire, which completely surrounds Napa City to the north and east, is raging over more than 43,000 acres.
Despite tireless efforts by emergency services, it is only three per cent contained.
The Tubbs Fire, which wiped out entire neighbourhoods in Santa Rosa earlier this week, is still burning over 27,000 acres. Crews have managed to contain 10 per cent of it so far.
And one fire is still burning over nearly 10,000 acres in the Anaheim Hills, east of Los Angeles.
Thick smoke from the blaze partially blocked out the sun over Disneyland casting an eerie orange glow over the popular theme park. Crews say they have this wildfire 60 per cent contained.
Most of the fires started on Sunday and quickly spread due to dry conditions and embers being carried by 50mph winds.
Cal Fire’s Mr Pimlott has previously said it was “unlikely” the fires were started by lightning, though he added it was impossible to be sure at this stage.