■ PG&E warned of power cuts in California amid gusty weather that could down lines.

SAN FRANCISCO — Pacific Gas & Electric may cut power to over 1 million people on Sunday to prevent the chance of sparking wildfires as extreme fire weather returns to the region, the utility said Friday.

The nation’s largest utility said it could black out customers in 38 counties — including most of the San Francisco Bay Area — as weather forecasts called for a return of bone-dry, gusty weather that carries the threat of downing or fouling power lines or other equipment that in recent years have been blamed for igniting massive and deadly blazes in central and Northern California.

The safety shutoffs were expected to start as early as Sunday morning and last into Tuesday, affecting 466,000 homes and businesses, or possibly more than 1 million residents.

Cuts are predicted to encompass parts of the Sacramento Valley, the northern and central Sierra Nevada, upper elevations of the San Francisco Bay Area, the Santa Cruz Mountains, the Central Coast and portions of southern Kern County.

The projected shutoffs included 19,000 customers in parts of Butte County, where a 2018 blaze ignited by PG&E equipment destroyed much of the town of Paradise and killed 85 people.

Forecasts call for the “driest humidity levels and the strongest winds of the wildfire season thus far,” a PG&E statement said.

The National Weather Service issued red flag warnings for many areas, predicting winds of 35 mph or higher in San Francisco and lower elevations and up to 70 mph in some mountains. The concern is that any spark could be blown into flames sweeping through tinder-dry brush.

Southern California continued to cool with patchy drizzle. Forecasters said light rain was expected Saturday night through early Monday.