https://www.mercurynews.com/2020/01/13/rain-arrives-in-bay-area-more-potent-system-to-follow/ > MONTEREY — Showers swept into the Bay Area on Monday night, and a second, more powerful system is slated to follow later this week, according to the National Weather Service. > The first system is expected to deliver up to half an inch of rain to the North Bay mountains and less than a tenth of an inch elsewhere, the weather service said in a briefing Monday.