UPDATE: PG&E has completed its Oct. 29 power shut-offs, and is now in the process of restoring power to customers. Here's when you can expect power to return around Northern California.

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Here we go again.

Even before all the lights were turned back on around the Bay Area (and the rest of Northern California), PG&E was entering a third public safety power shutoff in less than a month.

Pacific Gas and Electric announced this round of proactive power outages would affect about 596,000 customers, or about 1.8 million people. (PG&E estimates an average of three individuals per customer.) The shut-offs were scheduled to start rolling out Tuesday morning amid yet another Red Flag Warning.

The utility company hopes that by shutting off power during windy weather, it can prevent sparking more wildfires.

Customers in the following counties will be affected by blackouts, according to PG&E: Alameda, Alpine, Amador, Butte, Calaveras, Contra Costa, El Dorado, Humboldt, Kern, Lake, Marin, Mendocino, Napa, Nevada, Placer, Plumas, San Mateo, Santa Clara, Santa Cruz, Shasta, Sierra, Siskiyou, Solano, Sonoma, Tehama, Trinity, Tuolumne, Yolo and Yuba.

You can use the map below, created by PG&E, to determine whether or not your power will turn off — or in some cases, stay off — Tuesday and Wednesday. If PG&E's site is down, the map may not show up. In case that happens, we've included maps of the Bay Area in the gallery at the top of this story.

The blue areas on this map show where PG&E has planned outages for Tuesday, Oct. 29, 2019.

(PG&E says the boundaries drawn in the map are approximate, and its address lookup tool should be the most accurate.)

The first customers to lose power Tuesday morning will be in the North Valley, Sierra Foothills and North Bay Area, followed by those in the southern Sierra foothills Tuesday afternoon, Kern County Tuesday evening, and the greater Bay Area late Tuesday night into early Wednesday.

Here's the updated timeline for shut-offs. The times are estimates and may change (earlier or later) depending on weather:

4 a.m. Tuesday, Oct. 29

Butte, Plumas, Tehama, Trinity, and Shasta

7 a.m. Tuesday, Oct. 29

Humboldt (Southern), Mendocino, Sonoma, Lake, Marin, Napa, Solano and Yolo counties

8 a.m. Tuesday, Oct. 29

El Dorado, Nevada, Placer, Sierra, and Yuba counties

4 p.m. Tuesday, Oct. 29

Alpine, Amador, Calaveras, and Tuolumne

7 p.m. Tuesday, Oct. 29

Humboldt (Northern), Siskiyou counties

9 p.m. Tuesday, Oct. 29

Kern County

10 p.m. Tuesday, Oct. 29

Santa Clara, Santa Cruz, San Mateo, Alameda, and Contra Costa counties

(Editor's note: Customers in Marin County were originally scheduled to lose power late Tuesday, but PG&E started to de-energize parts of the county early than planned, starting around 7 a.m. More outages for Marin could come later in the day. PG&E made a few other tweaks to the schedule Tuesday afternoon, which are reflected in changes above.)

Here's the breakdown of which cities in each county PG&E says will be affected:

Alameda

Total: 10,306

Medical baseline: 352

Castro Valley, Oakland

Alpine

Total: 66

Bear Valley

Amador

Total: 12,132

Medical baseline: 623

Fiddletown, Jackson, Pioneer, Pine Grove, Sutter Creek, Volcano

Butte

Total: 15,790

Medical baseline: 1,131

Bangor, Berry Creek, Butte Meadows, Chico, Clipper Mills, Forbestown, Forest Ranch, Magalia, Oroville, Paradise, Stirling City

Calaveras

Total: 16,971

Medical baseline: 570

Arnold, Avery, Bear Valley, Glencoe, Hathaway Pines, Mokelumne Hill, Mountain Ranch, Murphys, Rail Road Flat, San Andreas, Sheep Ranch, West Point, White Pines, Wilseyville

Contra Costa

Total: 204

Medical baseline: 4

Canyon, Moraga

El Dorado

Total: 31,782

Medical baseline: 1,477

Camino, Coloma, Cool, Diamond Springs, Garden Valley, Georgetown, Greenwood, Grizzly Flats, Kelsey, Kyburz, Lotus, Mount Aukum, Pacific House, Pilot Hill, Placerville, Pollock Pines, Rescue, Shingle Springs, Somerset, Twin Bridges

Humboldt

Total: 66,447

Medical baseline: 2,068

Alderpoint, Alton, Arcata, Bayside, Blocksburg, Blue Lake, Carlotta, Eureka, Ferndale, Fieldbrook, Fields Landing, Fortuna, Garberville, Honeydew, Hoopa, Hydesville, Kneeland, Korbel, Loleta, McKinleyville, Miranda, Myers Flat, Orick, Orleans, Petrolia, Phillipsville, Redcrest, Redway, Rio Del, Samoa, Scotia, Trinidad, Weott, Whitethorn, Willow Creek, Weitchpec

Kern

Total: 839

Medical baseline: 27

Arvin, Bakersfield, Lebec

Lake

Total: 37,441

Medical baseline: 2,170

Clearlake, Clearlake Oaks, Cobb, Finley, Glenhaven, Hidden Valley Lake, Kelseyville, Lakeport, Loch Lomond, Lower Lake, Lucerne, Middletown, Nice, Upper Lake, Witter Springs

Marin

Total: 119,533

Medical baseline: 2,115

Belvedere, Bolinas, Corte Madera, Dillon Beach, Fairfax, Fallon, Forest Knolls, Greenbrae, Kentfield, Lagunitas, Larkspur, Marshall, Mill Valley, Muir Beach, Nicasio, Novato, Ross, San Anselmo, San Geronimo, San Rafael, San Quentin, Sausalito, Stinson Beach, Tiburon, Tamales, Wood Acre

Mendocino

Total: 38,137

Medical baseline: 1,331

Albion, Boonville, Branscomb, Calpella, Caspar, Cloverdale, Comptche, Covelo, Cummings, Dos Rios, Elk, Fort Bragg, Gualala, Hopland, Laytonville, Leggett, Little River, Manchester, Mendocino, Navarro, Philo, Piercy, Point Arena, Potter Valley, Redwood Valley, Ukiah, Westport, Willits, Yorkville

Napa

Total: 14,900

Medical baseline: 420

American Canyon, Angwin, Calistoga, Deer Park, Napa, Pope Valley, Rutherford, Oakville, Saint Helena, Yountville

Nevada

Total: 43,211

Medical baseline: 1,822

Grass Valley, Nevada City, Norden, North San Juan, Penn Valley, Rough and Ready, Soda Springs, Washington

Placer

Total: 22,996

Medical baseline: 897

Alta, Applegate, Auburn, Baxter, Colfax, Dutch Flat, Emigrant Gap, Foresthill, Gold Run, Lincoln, Meadow Vista, Newcastle, Penryn, Weimar

Plumas

Total: 785

Medical baseline: 6

Bellden, La Porte, Quincy, Storrie

San Mateo

Total: 13,209

Medical baseline: 242

El Granada, Half Moon Bay, La Honda, Loma Mar, Montera, Moss Beach, Pescadero, San Gregorio, Redwood City, Woodside

Santa Clara

Total: 496

Medical baseline: 12

Cupertino, Los Gatos, Milpitas, San Jose

Santa Cruz

Total: 5,408

Medical baseline: 280

Boulder Creek, Davenport, Santa Cruz

Shasta

Total: 26,700

Medical baseline: 1582

Anderson, Bella Vista, Cottonwood, French Gulch, Igo, Lake Head, Millville, Montgomery Creek, Oak Run, Pala Cedro, Platina, Redding, Round Mountain, Shasta, Shingletown, Whiskeytown, Whitmore, Big Bend, Manton

Sierra

Total: 1,159

Medical baseline: 14

Alleghany, Downieville, Goodyears Bar, Sierra City, North San Juan

Siskiyou

Total: 51

Somes Bar

Solano

Total: 19,785

Medical baseline: 901

Vallejo, Suisun City, Vacaville, Fairfield

Sonoma

Total: 86,686

Medical baseline: 2721

Annapolis, Bodega, Bodega Bay, Camp Meeker, Cazadero, Cloverdale, Cotati, Duncan Mills, Forestville, Geyserville, Glen Ellen, Graton, Guerneville, Healdsburg, Jenner, Kenwood, Monte Rio, Occidental, Penn Grove, Petaluma, Rio Nido, Rohnert Park, Santa Rosa, Sebastopol, Sonoma, Sea Ranch, Stewarts Point Valley Ford, Villa Grande, Windsor

Tehama

Total: 1,695

Medical baseline: 60

Corning, Flournoy, Los Molinos, Manton, Mill Creek, Mineral, Paskenta, Paynes Creek, Red Bluff

Trinity

Total: 1,046

Medical baseline: 39

Burnt Ranch, Salyer, Zenia

Tuolumne

Total: 2,591

Medical baseline: 26

Pine Crest, Strawberry, Twain Harte, Mi Wuk Village, Sonora, Tuolumne City

Yolo

Total: 290

Medical baseline: 12

Brooks, Guinda, Rumsey, Winters

Yuba

Total: 5,314

Medical baseline: 306

Browns Valley, Brownsville, Camptonville, Challenge, Dobbins Marysville, Oregon House, Rackerby, Smartsville, Strawberry Valley

The above list was compiled by PG&E, updated at 2 p.m. SFGATE was not able to independently verify the scope of the outages.

The high winds are expected to pass by mid-day Wednesday, at which point PG&E will issue an "all clear." But even after that happens, the power doesn't come back immediately. PG&E workers must inspect thousands of miles of power lines to ensure there's no damage. That can take up to 48 hours. In cases where there is damage to power lines or other PG&E infrastructure, power can be out even longer.

Tuesday's PSPS is set to be smaller than the weekend's, which affected 940,000 customers. An additional 100,000 customers lost power during the weekend wind event due to unanticipated damage to PG&E power lines and infrastructure.

As of early Tuesday morning, PG&E said 556,400 of those customers have had power restored.

Full PG&E outage coverage:

- Here's when and where PG&E will shut off power starting Tuesday

- How long does my food stay safe after the power goes out?



- Wind event: Strongest gusts forecast for the North Bay Tuesday night

- PG&E shares crater again; Newsom asks Buffett to buy utility

- Here’s why PG&E doesn’t put more power lines underground

Alix Martichoux is an SFGATE digital editor. Read her latest stories and send her news tips at alix.martichoux@sfgate.com.