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Pacific Gas and Electric is monitoring a potentially severe weekend wind event that could lead the utility company to turn off power to 850,000 Northern California customers in 36 counties. When you consider an average of three people per household, more than 2.5 million people may be impacted.

The critical fire weather is forecast to begin Saturday night and continue into Monday, and PG&E could start shutoffs Saturday afternoon before winds develop. Parts of Kern County could lose power on Sunday.

"Customers should prepare for a shutoff lasting 48 hours or longer, given the long duration of the wind event," the utility said in a statement released Friday afternoon.

Below is a list of the 36 counties that could be affected. The list includes cities where the lights are expected to go out and the estimated number of customers impacted in each county. (You can also find outage maps in the gallery above.)

Alameda

Total: 57,002

Medical baseline: 1,297

Albany, Berkeley, Castro Valley, Dublin, Fremont, Hayward, Livermore, Oakland, Piedmont, Pleasanton, San Leandro, Sunol

Alpine

Total: 66

Medical baseline: 0

Bear Valley

Amador

Total: 19,909

Medical baseline: 974

Amador City, Drytown, Fiddletown, Ione, Jackson, Martell, Pine Grove, Pioneer, Plymouth, River Pines, Sutter Creek, Volcano

Butte

Total: 19,151

Medical baseline: 1,398

Bangor, Berry Creek, Brush Creek, Butte Meadows, Chico, Clipper Mills, Cohasset, Feather Falls, Forbestown, Forest Ranch, Magalia, Oroville, Palermo, Paradise, Rackerby, Stirling City, Yankee Hill

Calaveras

Total: 30,819

Medical baseline: 1,398

Angels Camp, Arnold, Avery, Burson, Camp Connell, Campo Seco, Copperopolis, Dorrington, Douglas Flat, Glencoe, Hathaway Pines, Mokelumne Hill, Mountain Ranch, Murphys, Rail Road Flat, San Andreas, Sheep Ranch, Tamarack, Vallecito, Valley Springs, Wallace, West Point, White Pines, Wilseyville

Colusa

Total: 64

Medical baseline: 2

Arbuckle, Maxwell, Sites, Williams

Contra Costa

Total: 48,058

Medical baseline: 1,584

Alamo, Antioch, Brentwood, Byron, Canyon, Clayton, Concord, Crockett, Danville, Diablo, El Cerrito, El Sobrante, Hercules, Kensington, Lafayette, Martinez, Moraga, Orinda, Pinole, Pittsburg, Pleasant Hill, Port Costa, Richmond, Rodeo, San Pablo, San Ramon, Walnut Creek

El Dorado

Total: 56,643

Medical baseline: 2,774

Cameron Park, Camino, Cold Springs, Coloma, Cool, Diamond Springs, El Dorado Hills, Fair Play, Garden Valley, Georgetown

Greenwood, Grizzly Flats, Kelsey, Kyburz, Lotus, Mount Aukum, Pacific House, Pilot Hill, Placerville, Pollock Pines, Rescue, Shingle Springs, Somerset, Twin Bridges

Glenn

Total: 43

Medical Baseline: 2

Orland, Willows

Humboldt

Total: 66,870

Medical baseline: 2,084

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

Kern

Total: 839

Medical Baseline: 27

Arvin, Bakersfield, Lebec

Lake

Total: 37,441

Medical baseline: 2,170

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

Marin

Total: 118,535

Medical baseline: 2,084

Belvedere, Bolinas, Corte Madera, Dillon Beach, Fairfax, Fallon, Forest Knolls, Greenbrae, Inverness, Kentfield, Lagunitas, Larkspur, Marshall, Mill Valley, Muir Beach, Nicasio, Novato, Olema, Point Reyes Station, Ross, San Anselmo, San Geronimo, San Rafael, Sausalito, Stinson Beach, Tiburon, Tomales, Woodacre

Mariposa

Total: 809

Medical baseline: 42

Coulterville, Greeley Hill

Mendocino

Total: 38,433

Medical baseline: 1,342

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

Monterey

Total: 9,987

Medical baseline: 251

Aromas, Greenfield, Gonzales, Salinas, Soledad

Napa

Total: 17,878

Medical baseline: 498

American Canyon, Angwin, Calistoga, Deer Park, Lake Berryessa, Oakville, Pope Valley, Rutherford, St Helena, Yountville

Nevada

Total: 43,211

Medical baseline: 1,822

Chicago Park, Grass Valley, Nevada City, Norden, North San Juan, Penn Valley, Rough And Ready, Smartsville, Soda Springs, Washington

Placer

Total: 31,277

Medical baseline: 1,275

Alta, Applegate, Auburn, Baxter, Emigrant Gap, Foresthill, Gold Run, Granite Bay, Loomis, Meadow Vista, Newcastle, Penryn, Weimar

Plumas

Total: 785

Medical baseline: 6

Belden, La Porte, Quincy, Storrie, Twain

San Benito

Total: 1,369

Medical baseline: 39

Hollister, Paicines, San Juan Bautista

San Joaquin

Total: 375

Medical baseline: 5

Linden, Stockton

San Mateo

Total: 57,218

Medical baseline: 1,158

Belmont, Burlingame, Daly City, El Granada, Emerald Hills, Half Moon Bay, Hillsborough, La Honda, Loma Mar, Montara, Moss Beach, Pacifica, Pescadero, Portola Valley, Redwood City, San Bruno, San Carlos, San Gregorio, San Mateo, South San Francisco, Woodside, Unincorporated Communities in Southwest San Mateo County

Santa Clara

Total: 27,094

Medical Baseline: 823

Coyote, Cupertino, Gilroy, Los Altos, Los Altos Hills, Los Gatos, Milpitas, Monte Sereno, Morgan Hill, Redwood Estates, San Jose, San Martin, Saratoga

Santa Cruz

Total: 44,942

Medical baseline: 2,095

Aptos, Ben Lomond, Brookdale, Capitola, Corralitos, Davenport, Felton, Freedom, La Selva Beach, Mount Hermon, Santa Cruz, Scotts Valley, Soquel, Watsonville

Shasta

Total: 28,403

Medical baseline: 1,659

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

Sierra

Total: 1,159

Medical baseline: 14

Alleghany, Downieville, Goodyears Bar, Pike City, Sierra City

Siskiyou

Total: 51

Medical Baseline: 0

Somes Bar

Solano

Total: 25,524

Medical baseline: 1,158

Fairfield, Suisun City, Vacaville, Vallejo

Sonoma

Total: 95,647

Medical baseline: 2,941

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

Stanislaus

Total: 163

Medical baseline: 2

Knights Ferry, Oakdale, Patterson,

Tehama

Total: 19,238

Medical baseline: 1,218

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

Trinity

Total: 1,046

Medical baseline: 39

Burnt Ranch, Del Loma, Hawkins Bar, Platina, Salyer, Zenia

Tuolumne

Total: 33,776

Medical baseline: 1,490

Big Oak Flat, Chinese Camp, Columbia, Groveland, Jamestown, Long Barn, Mi Wuk Village, Pinecrest, Sonora, Soulsbyville, Strawberry, Tuolumme, Twain Harte

Yolo

Total: 530

Medical baseline: 15

Brooks, Capay, Esparto, Guinda, Rumsey, Winters

Yuba

Total: 5,502

Medical baseline: 313

Browns Valley, Brownsville, Camptonville, Dobbins, Loma Rica, Marysville, Oregon House, Strawberry Valley, Wheatland

Amy Graff is a digital editor for SFGATE. Email her at agraff@sfgate.com.

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