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.
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.
The combination of strong winds, low humidity, and dry vegetation makes for extremely dangerous conditions, city officials said.
More than 6,000 PG&E customers in Berkeley lost power Tuesday night, according to community reports and the utility’s outage map.