Updated 5:00 p.m. Monday, Aug. 24

A series of wildfires sparked by lightning beginning Aug. 16 has spread rapidly across wide stretches of the outer Bay Area, as fire crews contend with high winds, dry air and triple-digit temperatures amid an extended heat wave. Tens of thousands of residents from the North Bay to the Peninsula have been forced to evacuate in the face of three major groupings — or complexes — of out-of-control fires blazing across the region.

This post will be updated when new information is made available. Here's the latest on the three fire complexes:

• LNU Complex: Sonoma, Napa, Solano, Yolo, Lake counties
• SCU Complex: Santa Clara, Alameda, Contra Costa, San Joaquin, Stanislaus counties
• CZU Complex: San Mateo and Santa Cruz counties

LNU Lightning Complex

24-hour information line: 707-967-4207

Cal Fire incident information page

Cal Fire LNU Twitter Feed

The LNU complex of fires, ignited by a barrage of lightning strikes in Napa early on the morning of Aug. 17, consists of seven separate blazes burning in five different counties — including Sonoma, Napa, Solano and small sections of Yolo and Lake counties.

Evacuation orders

Firefighters and law enforcement officials are asking people to closely follow evacuation orders. A “high-low” siren will be used to alert residents it is time to leave, Cal Fire said.

Solano County

Find updated evacuation information on the Solano County Sheriff's Twitter feed. See a map of evacuation orders here. For evacuation questions call 707-784-1634 or 707-784-1635.

Napa County:

Evacuation orders in Napa County can be found at the county website here, on an evacuation map here and via the county's Twitter feed. For the most up-to-date information, county officials recommend residents reach out to the Cal Fire public information line at (707) 967-4207.

Sonoma County:

See updated county evacuation information here and an evacuation map here.

Evacuation centers and animal shelters

Solano County

• Padan School: 200 Padan School Rd., Vacaville
• Fairmont School: 1355 Marshall Rd., Vacaville
• Sierra Vista School: 301 Bel Air Dr., Vacaville
• Joseph Nelson Community Center: 611 Village Dr., Suisun
• Ulatis Community Center: 1000 Ulatis Drive
• McBride Senior Center: 91 Town Square Place
• Will C. Wood High School: 998 Marshall Rd, Vacaville
• Lambrecht Fields: Petersen Road, Suisun City
• Rodriguez High School: 5000 Red Top Rd, Fairfield
• Fairfield High School: 205 E. Atlantic Ave, Fairfield

Animal shelters:

• Service animals can be taken to Guru Nanak Sikh Temple at 2948 Rockville Rd. in Fairfield.
• Large animals can be taken to the Solano County Fairgrounds in Vallejo. Evacuees should enter via the Sage Street gate at the Fairgrounds and follow the signage to the livestock barn area. Questions: Please contact Solano County Animal Control at 707-784-4733
• Small pets can be taken to the Solano County Animal Shelter 2510 Claybank Rd

Napa County

Evacuation centers:

• Crosswalk Community Church: 2590 First Street in Napa

Animal shelters:

• Napa County Animal Shelter: 942 Hartle Court in Napa

Sonoma County

Evacuation centers:

• Bodega Bay: Westside Park at 2400 Westshore Road
• Healdsburg: Vets Memorial Beach at 13839 Old Redwood Highway
• Santa Rosa: A Place to Play at 2375 West 3^rd Street and Schopflin Fields at 4351 Old Redwood Highway
• Sebastopol: Ragle Ranch at 500 Ragle Road

Animal Shelters:

• The Sonoma County Fairgrounds is sheltering large animals.

Additional useful links with updated info

• Cal Fire Sonoma-Napa-Lake Unit
• Solano County Sheriff's Department
• Vacaville Fire District
• Fairfield Police Department
• Marin County Fire
• Sign up for Nixle Alerts for Solano County, Sonoma County, Napa County

SCU Complex

Information line: 669-247-7431

Cal Fire incident information page

Cal Fire SCU Twitter feed

The SCU Lightning Complex is approximately 20 separate fires broken into three zones; the Canyon Zone, the Calaveras Zone and the Deer Zone. The fires continue to burn in steep, rugged terrain in multiple locations across Santa Clara, Alameda, Contra Costa, San Joaquin and Stanislaus counties.

Some of the terrain has little to no fire history with ample fuel build up, conducive to extreme fire growth.

Evacuation orders

Santa Clara County

Find the latest information on evacuations here, and an official map here. The county's hotline for residents under evacuation orders is (408) 808-7778.

Alameda County

Find the latest evacuation information on Cal Fire's incident site, and by signing up for Nixle alerts here.

Contra Costa County

Check the county's Community Warning System for new alerts, and sign up for Nixle alerts here.

Evacuation Centers

Santa Clara County

• Quinlan Community Center: 10185 N Stelling Rd, Cupertino. Includes RV parking, residents who may be interested in safe camping locations should bring tents and sleeping bags if possible​
• Creekside Middle School: 535 Peregrine Dr. Patterson, CA 94363
• Ann Sobrato High School: 401 Burnett Ave, Morgan Hill. Not a shelter, but serves to assist residents with temporary housing needs

Additional useful links with updated info

• Cal Fire SCU Twitter feed
• Sign up for Nixle Alerts for Santa Clara County, Alameda County and Contra Costa County

CZU Lightning Complex

Cal Fire information line: 831-335-6717

Cal Fire incident information page

Cal Fire CZU Twitter feed

The CZU August Lightning Complex fire consists of multiple smaller lightning-sparked fires in the Santa Cruz mountains which merged into a massive, dangerous blaze burning in Santa Cruz and San Mateo counties.

Evacuation orders

San Mateo County

Evacuation updates can be found at the SMC Wildfire Response page here, and via the county's Twitter account.

Santa Cruz County

Residents can find a map and list of current evacuation orders here, and can sign up for email alerts here.

Emergency shelters

• San Mateo County: Half Moon Bay High School 1 Lewis Foster Dr in Half Moon Bay (Note: Moved out of Pescadero due to fire risk)
• Santa Cruz County: Find up-to-date shelter status information here. Note: the county fairgrounds site is now full.

No animal shelters have been listed yet. If you need assistance evacuating animals, call: 831-454-7200.

Additional useful links with updated info

• Cal Fire CZU (Twitter)
• County of Santa Cruz
• Santa Cruz County Sheriff's Office
• Santa Cruz County residents can sign up for emergency alerts here and here.
• San Mateo County residents can sign up for emergency alerts here.

This post will be updated.
KQED's David Marks contributed to this story.