Live California Fires Updates

The fires have burned through more than 350,000 acres.

Wildfires continued to rip across Northern California on Thursday, as the state struggled to contain the blazes and to help thousands of people who are fleeing their homes amid a grueling heat wave, the coronavirus pandemic and unsafe air thick with smoke.

A large group of fires burning in wine country west of Sacramento had grown to cover 131,000 acres by Thursday, according to Cal Fire, the state’s fire authority. The agency said that, in all, nearly 350,000 acres have burned in Northern and Central California, with many fires sparked by lightning strikes in the high heat and then fanned by winds.

Those conditions helped new fires sprout across the state on Wednesday and Thursday, and caused other fires to merge, complicating efforts to contain the combined blazes. Almost two dozen major fires were reported on Wednesday, and more than 300 smaller ones. Evacuation orders have affected thousands of people in Northern California. The group of wildfires threatening Vacaville, called the L.N.U. Lightning Complex, has already destroyed more than 105 homes and other buildings. Cal Fire said 30,500 more buildings are under threat.

California was under intense strain from the heat wave even before the explosion of new fires, with rolling blackouts shutting off power to many residents. The temperature on Thursday was expected to again surpass 90 degrees in Sacramento, Napa and Sonoma Counties.

East of Silicon Valley, the S.C.U. Lightning Complex group of fires prompted evacuation orders on the edge of San Jose. That combination of about 20 fires grew to 137,475 acres overnight, but has largely been kept away from more populated areas.

Brice Bennett, a spokesman for Cal Fire, said firefighters had started to see cooler temperatures and calmer winds at night, allowing them to begin to try to contain the blazes. Firefighters often make more progress at night, but recently the winds and high temperatures had kept up even after sunset. Mr. Bennett said he did not expect the reprieve to last, though, so firefighters were trying to do as much as they can at night.

“We don’t have the winds that we did three days ago, and that’s a huge impact,” he said. “Mother Nature’s in charge, so we’re just doing what we can with the window that we’re given.”

Smoke is making the air unhealthy to breathe in many places.

Even far from the fires, the air smells like smoke and ash flakes can be seen on cars and in backyards.

The air quality around the Bay Area improved slightly on Thursday but is still dangerously unhealthy in some areas, particularly around Vacaville, which is near Sacramento, and in Concord.

The air quality index, which measures air pollution, has surpassed 150 in some areas, meaning the air is unhealthy for people even if they have no health risks, and especially dangerous for people who are sensitive to unclean air. The index goes up to 500, but anything above 100 is considered unhealthy.

People should avoid going outside at all, especially to exercise, while the air quality is in the unhealthy range, said Dr. Afif El-Hasan, a lung health specialist in Orange County. He said the smoke could also make people more vulnerable to the coronavirus, if they were infected.

“Anything that weakens the lungs, like really bad air, which causes the lungs to lose some of their ability to fight infection, is going to be an issue,” Dr. El-Hasan said. “In theory, breathing in a lot of bad air can make you more susceptible to a more serious Covid illness.”

Dr. Seth Kaufman, the chief medical officer for NorthBay Healthcare, which has hospitals in Vacaville and nearby Fairfield, said the fire was practically in the hospitals’ backyard, and that patients had already come in complaining of breathing problems and injuries from the fire.

“I think it’s the worst air quality we have seen in our years dealing with wildfire exposure,” Dr. Kaufman said.

Many of the symptoms of smoke inhalation overlap with those caused by the coronavirus, he said, so people who are coughing should consider that they may have the virus and isolate themselves as much as possible.

Roger Gass, a meteorologist at the National Weather Service’s Bay Area office, said winds were pushing smoke from the wildfires toward larger population areas, where it is then sitting still. Often, winds will push smoke inland or out to sea, but the wind is instead blowing the smoke slowly south.

“We’re basically stuck in a stagnant pattern,” he said, adding that he did not expect any significant change in the coming days if the fires continue to rage.

“They’re just pumping more smoke into the air,” Mr. Gass said of the blazes. “It looks like it’s going to be here to stay for a little while.”

Santa Cruz County asked visitors to leave to make room for evacuees in hotels.

Visitors and tourists staying in overnight accommodations like hotels or vacation rentals are being asked to leave Santa Cruz County to make room for fire evacuees.

“It’s not an order, we are just having issues with more than 20,000 people evacuated and this is likely going to get significantly larger today,” a spokesman for the Santa Cruz County Emergency Operations Center, Jason Hoppin, said. “So we need all the capacity we can get.”

A group of fires known as the C.Z.U. August Lightning Complex has grown to cover more than 40,000 acres in Santa Cruz County, fire officials said on Thursday, and has destroyed 20 buildings. The Santa Cruz Sheriff’s Office said nearly 28,000 people had been ordered to evacuate their homes.

The county is also requesting that no new visitors travel to the area.

“The environment here is not conducive to any kind of tourist activity,” Mr. Hoppin said. “The sky is thick with smoke, it’s yellow. I live 10 miles away from the fire and my deck is covered with ash.”

Local shelters are nearing capacity, the emergency center wrote in a statement, so evacuees should try to stay with friends or family. Residents who have not evacuated have also offered their yards for their neighbors to camp in.

The historic Big Basin Redwoods State Park has been badly damaged by fire.

California’s oldest state park, Big Basin Redwoods State Park, has sustained extensive damage from the C.Z.U. August Lighting Complex fires, according to the California Parks and Recreations Department.

The park is known for its 80 miles of walking trails among the majestic redwoods that are between 1,000 and 2,000 years old.

The fire damaged the park’s headquarters, a one-story building constructed from redwood logs and stone that was built in 1936 and is included in the National Register of Historic Places. Also damaged was the park’s “historic core and campgrounds,” the department said.

More than two dozen parks were partially or fully closed as the wildfires burned across the state, according to the department.

Sara Barth, executive director of the Sempervirens Fund, an organization dedicated to the protection of redwoods, said park officials told her that conditions at Big Basin remain too dangerous for anyone to assess damage to the trees.

During the pandemic, people have gone to see the enormous redwoods in an effort to find solace and perspective, Ms. Barth said.

The fire “would be a tragedy at any point,” she said. “But it feels especially cruel and apocalyptic at a time of so many other crises.”

Still, Ms. Barth said there was reason to be optimistic about the fate of the trees.

“They’re meant to resist and even thrive in response to wildfires,” she said. “If any place is going to be able to withstand this conflagration it’s Big Basin.”

Poor planning by grid managers and regulators led to rolling blackouts.

Everybody had known for days that a heat wave was about to wallop California. Yet a dashboard maintained by the organization that manages the state’s grid showed that scores of power plants were down or producing below peak strength, a stunning failure of planning, poor record keeping and sheer bad luck.

All told, power plants with the ability to produce almost 6,000 megawatts, or about 15 percent of the electricity on California’s grid, were reported as being offline when the temperatures surged last Friday. The shortfall, which experts believe officials should have been able to avoid, forced managers of the state’s electric grid to order rolling blackouts in the middle of a pandemic and as wildfires were spreading across the state.

“This is like brain surgery,” said Robert McCullough, an Oregon-based utility industry consultant. “You don’t make mistakes. People actually die when you mess it up.”

Mr. McCullough said the last time California saw power outages total 15 percent or more during the summer peak was in 2000 and 2001 when the state was grappling with an energy crisis created by a botched deregulation of the energy industry and market manipulation by traders at Enron and other companies. Like then, wholesale electricity prices in California spiked in recent days because of the supply shortfall.

“It’s bizarre. It’s unbelievable,” he said, adding that North American grids are typically designed to handle outages of up to about 7 percent.

But even if all of the missing capacity had been available, California would probably still have struggled to deliver enough electricity to homes where families were cranking up air-conditioners. The manager of the electric grid and state regulators were relying on power from plants that had either permanently shut down or could not have realistically achieved the targets that had been set.

California’s ‘lightning siege’ has connections to climate change.

A state fire official described it as a “historic lightning siege” — the nearly 11,000 bolts of lightning that struck California over 72 hours this week and ignited 367 wildfires.

Such a flurry of strikes is unusual in California, where it normally takes a full year to tally up 85,000 or so lightning flashes, said Joseph Dwyer, a physicist and lightning researcher at the University of New Hampshire. That is far fewer than Florida, one of the most lightning-prone states, which averages about 1.2 million flashes a year.

Lightning occurs during storms with strong updrafts. During these storms, charged ice particles in clouds collide, generating an electric field. If the field is strong enough, electricity can arc to the ground as lightning, which can ignite dry vegetation: Nationwide, about 15 percent of wildfires start this way.

Strikes across the United States are expected to increase with climate change, as warmer air carries more water vapor, which provides the fuel for strong updraft conditions. A 2014 study estimated that strikes could increase by about 12 percent per 1.8 degree Fahrenheit (1 degree Celsius) of warming, or by about 50 percent by 2100.

California has been experiencing an intense heat wave this week, and while it is too soon to say precisely how climate change influenced this specific bout of hot weather, “it is likely that there was more lightning because of global warming,” said David M. Romps, a physicist at the University of California, Berkeley, and the lead author of the 2014 study.

“What you could say with certainty is that it was hotter with global warming,” Dr. Romps said. “And certainly the vegetation was drier because of warming. If there were also more lightning strikes, as we would expect, that’s just an additional bump in the direction of more fire.”

Healdsburg residents are told to be ready to flee yet to ‘remain calm.’

In Sonoma County, the authorities issued an evacuation warning late Wednesday to the city of Healdsburg, which is home to 12,000 people.

“Please remain calm,” the city government said in a statement. “Our goal is to increase your state of readiness, not to frighten you.”

Residents in the city prepared to flee as officials ordered evacuations in parts of several other counties, including San Mateo, Santa Cruz, Alameda, Stanislaus and Sonoma. Travis Air Force Base in Solano County mandated the evacuation of all “non-mission essential personnel” as the L.N.U. Lightning Complex fires approached on Wednesday night.

Shaun McCaffery, an engineer and vice mayor of Healdsburg, said he packed his family’s 22-foot trailer with frozen pizzas, chicken nuggets, water, clothes and books in case he, his wife and his two stepchildren have to get out.

He planned to head to Oregon, where the family vacationed in their trailer this year. Mr. McCaffery said he bought the trailer in May at the suggestion of his wife, who thought the family needed a “fire escape vehicle” after wildfires last year.

“I know some friends of ours immediately left town,” Mr. McCaffery said. “The city is not in imminent danger but they’re worried about the behavior of the fire due to the winds.”

The city, which is nestled among the county’s wineries and is dotted with farm-to-table restaurants, came under evacuation orders last October during the Kincade Fire, which burned through more than 76,000 acres in Sonoma County.

Mr. McCaffery said his stepchildren, a 12-year-old girl and 14-year-old boy, have remained calm throughout the most recent ordeal.

“They’re amazing. They’re very resilient,” he said.

He added: “I’m really proud of them for persevering in the kind of crazy world that we live in these days.”

Have you evacuated because of the fires? If you are in a safe place and able to do so, we would like to hear about whether you have been forced to leave or if you have left your home in anticipation of an evacuation order. Please email us at [email protected]. Thank you.

Coronavirus outbreaks in prisons mean fewer inmates are available to fight fires.

As wildfires race across California, civilian firefighters are missing a critical and usually dependable ally: inmate firefighting crews.

The fire crews, along with other California prisoners, have been hard hit by the coronavirus, which is sweeping through the state’s correctional facilities.

In California state prisons, more than 12,000 inmates and guards have been infected, and at least 64 people have died, according to the state corrections department.

This summer, only 90 of the state prison’s 192 inmate fire teams are available to help clear brush and perform other important firefighting tasks, according to Cal Fire.

While a number of inmate firefighters have become infected, other crews are under quarantine orders. Some firefighters have also been released from prison in recent weeks to reduce overcrowding in prisons and fire camps.

In all, four of the six prisons that train incarcerated firefighters have had coronavirus outbreaks of more than 200 cases each, including the California Institution for Women in Corona, which trains female firefighters. That prison has had 417 cases.

The shortage has forced the state to enlist members of the National Guard and to hire civilian replacements for the inmate crews, officials said.

Members of the inmate crews — who can earn up to just over $5 a day, plus $1 an hour when fighting fires — have been stretched thin for several weeks, said Michelle Garcia, program coordinator at an inmate fire training facility center in Ventura County.

“We’re neglected and we’re overlooked,” she said.

Ms. Garcia said that crew members had been drinking out of the same water spigot and that washing hands, social distancing and wearing face masks were afterthoughts.

“Once that fire call hits, it’s fire first,” she said. “Fire doesn’t care about Covid.”

Reporting was contributed by Nicholas Bogel-Burroughs, Kellen Browning, Maria Cramer, Henry Fountain, Thomas Fuller, Rebecca Griesbach, Ivan Penn, Lucy Tompkins, Maura Turcotte and Alan Yuhas.