Downed trees and fallen traffic signals prompted police to warn people away from a few North Berkeley neighborhoods in the middle of the night.
The storm is expected to continue through Sunday evening into Monday.
PG&E has not indicated it is planning to cut power during the wind event, but said plans could change.
Berkeley will no longer funnel messages from AC Alert to Nixle to prevent redundant messages and confusion, the city announced.
Preparation advice, evacuation guidance and answers to your questions about air quality, power outages and defending your property.
The combination of heavy rains and wind can create hazardous conditions.
Winds reached 40-50 mph Monday night and Tuesday morning, with stronger gusts in the hills.
Thousands of customers were without internet Tuesday in Berkeley as Comcast responded to damaged fiber cables from fire at a shared PG&E utility pole in San Pablo.
The combination of strong winds, low humidity, and dry vegetation makes for extremely dangerous conditions, city officials said.
Some 17,000 PG&E customers in Berkeley could be affected Tuesday evening by rolling blackouts “if people do not limit electricity usage,” the city says.
Tens of thousands of PG&E customers in Berkeley could lose power Tuesday and Wednesday because of high energy demands statewide, the city says. PG&E said there were ultimately no rolling outages in California on Monday.
More than 6,000 PG&E customers in Berkeley lost power Tuesday night, according to community reports and the utility’s outage map.