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Update: Wildfires spread to 325,000 acres in Napa County and North Bay; lightning to heighten fire risk

Update: Wildfires spread to 325,000 acres in Napa County and North Bay; lightning to heighten fire risk

Updated at 8:08 p.m. Saturday – CALISTOGA – Firefighting and weather authorities are warning of a new round of Bay Area lightning storms starting Sunday morning that could further inflame the cluster of wildfires that has scorched swaths of Napa County and the North Bay.

Meteorologists warned of a fresh wave of the same dry lightning that triggered the LNU Lightning-related Complex of wildfires on Monday, raising concerns of fresh fire outbreaks in the region’s parched woodlands. The complex consisting of fires in Napa and four other counties grew to 325,128 acres by 7:40 p.m. Saturday and were 15 percent contained, Cal Fire reported.

The National Weather Service issued a red flag warning for the entire Bay Area from 5 a.m. Sunday to 5 p.m. Monday, forecasting scattered dry thunderstorms across much of Northern California. Wind gusts may reach 30 to 65 mph in the vicinity of lightning storms.

The unstable weather includes elevated moisture from the remnants of Hurricane Genevieve and is expected to move over the Bay Area through the weekend, the weather service said in announcing the warning. A low-pressure pattern off the Pacific coast may strengthen thunderstorms, allowing some to generate frequent lightning strikes and erratic, strong winds – possibly triggering new wildfires while causing already burning ones to shift unpredictably.

Cal Fire officials issued a news release warning of the potential for fresh fires and continued expansion of existing blazes due to lightning strikes and wind gusts, and said flames are continuing to run in multiple directions toward multiple communities.

Ahead of the lightning warning, smoke from the Northern California wildfires is contributing to the extension of Bay Area air quality warnings into mid-week. The Bay Area Air Quality Management District announced it would extend a Spare the Air alert through Wednesday, citing soot levels unhealthy for people sensitive to air pollution.

Evacuation orders remained in force for various rural communities in north and east Napa County, including Lake Berryessa, Angwin, Deer Park and Pope Valley. Cal Fire announced new evacuation orders Saturday morning for parts of Sonoma County near Healdsburg, Windsor and Forestville and in Lake County Saturday afternoon south of Morgan Valley Road in Lake County.

A list of areas under evacuation orders and warnings, as well as where evacuees can go and other information about the LNU Lightning Complex fires, is available from Cal Fire at

More than 12,000 lightning strikes have been reported across California since Aug. 15, and 585 wildfires have been recorded since, Cal Fire Division Chief Jeremy Rahn reported during a press conference Saturday at the Napa County Fairgrounds in Calistoga.

During the half-hour briefing, Cal Fire officials cautioned North Bay residents to make themselves ready for a sudden elevation in fire danger.

“All of our resources remain stretched to a capacity we have not seen in recent years,” Unit Chief Shana Jones said of the possibility of lightning and winds complicating the fire battle. “... You have to evacuate when told to do so; you have to help us help you. Please be prepared – this fire is extremely dynamic.”

As of Saturday morning, there were 194 fire engines, 35 water tenders, 11 helicopters, 13 hand crews, and 36 bulldozers assigned to the LNU Fire Complex, according to Cal Fire Chief Sean Kavanaugh. Total personnel count has increased to 1,349, as Cal Fire has designated the North Bay fires the top priority among hundreds that are burning across the Golden State and stretching resources, Kavanaugh said Saturday in Calistoga.

While relatively temperate wind and heat allowed fire crews to make progress against the North Bay fires on Friday, Kavanaugh warned that fresh fires are likely with the arrival of lightning and that residents should be read to head to safer ground if necessary.

“It’s going to be our job to get on those fires: identify them and get the resources out to those incidents so we don’t get large fires breaking out,” he said. “We ask of the public that when you get those (evacuation) orders, please adhere to those orders. Please be ready to go; if you have time right now, we ask people to prepare their homes, prepare their livestock, prepare their animals, prepare for their families to leave their homes safely.”

The combined size of the fires burning in Napa, Sonoma, Solano, Lake and Yolo counties makes the complex the second largest in California history, behind only the Mendocino Complex fires that burned more than 459,000 acres in 2018, according to Cal Fire.

Four people have died in the fires, three from Napa County and one from Solano County. Four others have been injured.

The blazes have destroyed 845 structures and damaged 231 others, while another 30,500 structures remain threatened, Cal Fire reported Saturday evening.

The Hennessey Fire, the largest in the complex, includes several merged fires in Napa and Lake counties and had burned 271,714 acres with 17% containment late Saturday.

Evacuation orders remain in effect for many of the eastern Napa County woodlands including the Lake Berryessa, Angwin, Deer Park and Pope Valley areas.

The Walbridge Fire in Sonoma County, which merged with the Stewarts Fire, has burned more than 51,069 acres with zero containment late Saturday, Cal Fire said.

Statewide, there have been 585 fires over the last week — many sparked by thousands of lightning strikes — that have burned nearly a million acres, or 1,562 square miles, according to Cal Fire.

On Saturday, U.S. Rep. Mike Thompson, D-St. Helena, announced the approval of public and individual federal disaster relief for the five counties, including Napa, affected by the LNU Lightning Complex fires.

The move by the Federal Emergency Management Agency covers 75 percent of the cost of “emergency work and the repair or replacement of disaster-damaged facilities,” with California and local governments covering the balance, Thompson said in a statement.

Also approved was individual assistance for those needing to repair, rebuild or replace housing lost to the fires, as well as help with other disaster-related expenses.

Individuals can register with FEMA online at They may also call the registration phone number at 800-621-3362; those who have a speech disability or hearing loss and use TTY, should call 1-800-462-7585 directly. For those who use 711 or Video Relay Service (VRS), call 800-621-3362.

Editor’s Note: Because of the public safety implications of the wildfires, we are providing access to this article free of charge. To support local journalism, please visit and consider becoming a member.

Weekly Calistogan editor Cynthia Sweeney contributed to this report.

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Public Safety Reporter

Howard Yune covers public safety for the Napa Valley Register. He has been a reporter and photographer for the Register since 2011, and previously wrote for the Marysville Appeal-Democrat, Anaheim Bulletin and Coos Bay (Oregon) World.

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