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Updated:December 21, 2025 6:45 pm PST

Flood Watch FLOOD WATCH  
Sonoma County

  Effective: Sun, 12/21 1:50pm Severity:  Severe 
  Updated: December 21, 2025 6:45 pm Urgency: Future
  Expires: Sun, 12/21 10:00pm Certainty: Possible

Areas Affected: Marin Coastal Range - Sonoma Coastal Range - North Bay Interior Mountains - Coastal North Bay Including Point Reyes National Seashore - North Bay Interior Valleys
 
Alert Details:
* WHAT...Flooding caused by excessive rainfall continues to be
possible.

* WHERE...Northern San Francisco Bay Area (Napa, Sonoma, and Marin
counties).

* WHEN...Through Monday afternoon.

* 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 crossing
may become flooded. Standing water is likely in urban areas.

* ADDITIONAL DETAILS...
- Moderate to heavy rain associated with an atmospheric river will
impact the region. 2-3" of rain is expected in the valleys during
the watch period, with up to 6" in the coastal mountains. Area
rivers, streams, and creeks that are prone to flooding could see
rapid rises during and after heavy rainfall. There is a slight
chance for flash flooding, particularly in urban areas Sunday and
Monday. Debris flows are possible particularly for the Pickett
Burn Scar.
- http://www.weather.gov/safety/flood

Information:
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.