Updated 12:35 p.m. Tuesday, Aug. 17, 2021.
PG&E says it may shut off power beginning Tuesday night to about 48,000 customers in parts of 18 Northern California counties to prevent its equipment from igniting wildfires amid gusty winds, high temperatures, low humidity and extreme drought conditions.
In the Bay Area, about 6,700 customers could be affected in Napa, Sonoma and Solano counties. Another 350 could have their lights turned off in eastern Contra Costa and Alameda counties.
The potential for what PG&E terms a public safety power shutoff was rated as an "outage watch" on Tuesday, indicating that the utility believes shutoffs are likely.
The National Weather Service's San Francisco Bay Area office on Tuesday tweeted a "dry, gusty offshore flow will develop over the interior North Bay Mountains and East Bay Hills/Diablo Range tonight through midweek," and issued a red flag warning for the region starting Tuesday at 11 p.m. and lasting through 3 p.m. Wednesday. The NWS said winds could gust to 45 mph, with maximum gusts of up to 55 mph at the highest elevations.

