Rain started falling in the Bay Area on Monday morning and was expected to continue into the night.
The updating radar map above shows current areas of precipitation in green, with greater intensities indicated by yellow and orange.
The low-pressure system will be accompanied by gusty winds up to 35 mph in the Bay Area hills and possible thunderstorms and hail, the National Weather Service said. The heaviest rainfall was expected during the evening commute.
In the Sierra Nevada, heavy snow was forecast for Lake Tahoe and a flood watch was in effect for Yosemite.