It's a record-breaking day! It has never in the history of the world (or, rather, in the history of weather record-keeping) rained on a July 18th before in the Bay Area.
The .01 inches of rain that's fallen has, naturally, rendered swaths of the East Bay without power, with 40 separate outages and about 10,000 in El Cerrito, Berkeley, and El Cerrito Richmond affected. Basically, the dust on top of the transformers get wet, turns into mud, and the low levels of rain are insufficient to wash off the mud, so the mud gets trapped in the transformer and the transformer shorts out. (A power line is also down at Ashby and MLK. Wow, .01" of rain can take down a power line?)
The skies should clear later this morning, it'll be cool today, and warm up for the weekend.
Gene Kelly singin', and dancin', in the rain.