California Governor Jerry Brown declared a state of emergency in three northern counties -- Napa, Sonoma, and Yuba - and said thousands of firefighters had been deployed to fight the blazes.
Seven deaths were reported in Sonoma County, two in Napa County, one in Yuba County and one in Mendocino County and the governor said "emergency responders anticipate the number of fatalities could grow."
Among the dead in Napa were a couple aged 99 and 100 years old who had been married for 75 years, KTVU-TV said. They were unable to evacuate their home in time.
Appealing yesterday to President Donald Trump for federal aid, Brown said at least 18 fires had broken out in seven counties.
"These fires have been extremely difficult to contain and many remain at zero percent containment," he said. "The devastation and disruption caused by these fires is extraordinary.
"Thousands have been made homeless."
Troy Newton, 46, a Sonoma County sheriff's detective, told The Los Angeles Times he was returning to his home in the Santa Rosa neighbourhood when he saw a "growing red snake" of fire.
"It was boom, boom, boom. Ring the door bell. Boom, boom - until someone inside got the message," he said.
Ken Pimlott, director of the California Department of Forestry and Fire Protection (CalFire), said the fires were being spread by 50- to 60-mile per hour (80-100 kilometre per hour) winds.
Many homes in Santa Rosa, the county seat of Sonoma, were razed to the ground and the Hilton Sonoma County Wine Hotel, Fountaingrove Inn and Willi's Wine Bar reportedly suffered damage.
Among the wineries which reportedly suffered damage were William Hill Estate Winery in Napa, Signorello Vineyards, Stags' Leap and Chimney Rock.
Coffey Park, a sprawling Santa Rosa neighbourhood with dozens of homes, was left in ruins.
Cheri Sharp told Oregon-based TV news channel KOBI her home of 26 years in Santa Rosa was among those destroyed.
"All our pictures are gone. Everything, everything is gone," she said.
Pacific Gas & Electric said more than 196,000 customers had initially lost electricity although half had had their power restored.
Marian Williams of Kenwood, in Sonoma County, told NBC Bay Area she joined a convoy of neighbors driving through the flames before dawn as one of the fires reached the area's vineyards.
"It was an inferno like you've never seen before," Williams told the station.
Governor Brown in April declared the official end of the state's drought that lasted more than five years.
Forest fires are common in the western United States during dry, hot summer months.
Last month, a massive fire described as the biggest in the history of Los Angeles forced hundreds to evacuate their homes.
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