Active AlertsMarin Coastal Range

What: Flooding caused by excessive rainfall continues to be possible from multiple lines of showers and thunderstorms, strong at times, moving across the area.
Where: The Northern San Francisco Bay Area (Napa, Sonoma, and Marin counties).
When: Through Friday evening.
Impacts: Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low water crossings may become flooded. Flooding may occur in poor drainage and urban areas.
Additional Details: - Multiple rounds of moderate to heavy rainfall are expected across the North Bay through Friday evening. An additional 3-5" is possible over the North Bay Mountains and 2-3" over the North Bay Valleys by Friday. Nuisance flooding will increase throughout the week with sharp rises in smaller creeks and minor flooding along some of the mainstream rivers (Russian River, Napa River). Debris flows are possible particularly for the Pickett Burn Scar. - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.