I've been unaffected where I live in East Contra Costa county (no flooding or blackouts) but the effects of the storm elsewhere in NorCal -- espeically in Santa Cruz, Sonoma, Mendocino & Sacramento counties -- are pretty horrendous.
People downed and completely blocked Hwy99 when levees broke south of Sac near Wilton. I go to a resort there in summer and the resort has reported a voluntary evacuation for the week. The storm also devastated the town of Capitola just south of Santa Cruz.
Can't count the # of road closures due to flooding/sink holes/fallen trees and power outages due to fallen trees and other things and there are more problems still to come.
Hwy 1 south of Carmel and north of SLO at Big Sur is also blocked which is not uncommon but still a PITA. Hwy 1 from Daly City to Half Moon Bay was also blocked at Devil's Slide, also a common problem point but roads inland which normally do not have such problems, like the road from Felton to Santa Cruz and from Sonoma to Petaluma are also reportedly blocked. Hwy 13 that runs thru the hills of Oakland was entirely blocked due to a fallen trees this morning and, even a few back roads near my place towards Clayton/Walnut Creek are blocked.
So, it's really pretty bad up here.