At 2:04 pm Thursday a brush fire ignited in the area of Hill Canyon in the Santa Rosa Valley, now called the Hill Fire. By last night it had scorched up to 7,000 acres.
At least 75,000 homes in Ventura and Los Angeles counties are under evacuation orders, and some structures have already been destroyed, officials said.
The fire department said 30,000 homes were threatened in a tweet Friday morning.
However there were no immediate reports of deaths or serious injuries.
The blaze that started Thursday morning east of Paradise and decimated the town also spread to the west.
A strike team of five fire engines and a battalion chief was sent at about 4 p.m., said Long Beach Fire Department spokesman Jack Crabtree.
Borchard Community Center, Rancho Santa Susana Recreation Center, Camarillo Community Center, Thousand Oaks Teen Center, and Goebel Adult Community Center are open in Ventura County.
Evacuation notices were announced for Chico, which is home to around 93,000 people and is about 90 miles north of Sacramento.
More than 400 firefighters from Ventura County, Los Angeles County, the City of Los Angeles and Cal Fire were battling the brush fire.
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Voluntary evacuations have been added in Ventura County for Lake Sherwood and the area south of Hwy 101 and north of Potrero Road between Westlake Boulevard and Wendy Drive in Thousand Oaks.
The Ventura County Fire Department reports structures, outbuildings, and vehicles have been damaged and destroyed. "I pray everyone is safe", she wrote.
Meanwhile officials in northern California say a wildfire that devastated a town of 27,000 is moving north and have ordered people in two Sierra Nevada foothill communities to leave their homes.
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Multiple fires were reported at more than 10,000 acres with high rate of spread and mandatory evacuation orders in place as of 8 a.m. Friday, according to Cal Fire.
Residents took to social media to share their views of the flames almost consuming the hillside in Newbury Park, which borders Thousands Oaks to the west.
Fire officials anticipate the fire will reach the Pacific Ocean.
The Santa Anas are strong, dry winds that high-pressure systems push from east to west, from the mountains and desert areas down into the Los Angeles area.
Heavy smoke and strong winds hampered visibility for crews on the firelines and residents trying to evacuate fire zones.