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Sonoma County Alerts
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WARNINGS - WATCHES - ADVISORIES - STATEMENTS
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Updated:December 5, 2025 9:01 pm PST

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Sonoma County

Effective: Fri, 12/5 12:49pm Severity: Minor
Updated: December 5, 2025 9:01 pm Urgency: Expected
Expires: Sat, 12/6 5:00am Certainty: Likely

Areas Affected: San Francisco - North Bay Interior Valleys - San Francisco Bay Shoreline - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast
 
Alert Details:
* WHAT...Up to 1.7 ft of inundation above ground level is
possible in low lying areas near shorelines and tidal waterways.

* WHERE...Bayshore locations along San Francisco and Monterey
Bay.

* WHEN...Until 3 PM PST Sunday.

* IMPACTS...Flooding of lots, parks, and roads with only
isolated road closures expected.

* ADDITIONAL DETAILS...The San Francisco tidal gauge high tide is
expected to be 1.7 ft above normal (7.51 ft MLLW) at 11:25 AM
Saturday and 0.9 ft above normal (6.75 ft MLLW) at 12:17 PM
Sunday. High tide timing varies up to 90 minutes earlier or
later along the Pacific Coast and throughout the San Francisco
Bay respectively.

Information:
If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.
Cold Weather Advisory COLD WEATHER ADVISORY  
Sonoma County

Effective: Fri, 12/5 8:38pm Severity:  Moderate 
Updated: December 5, 2025 9:01 pm Urgency: Expected
Expires: Sat, 12/6 8:00am Certainty: Likely

Areas Affected: Marin Coastal Range - North Bay Interior Mountains - North Bay Interior Valleys
 
Alert Details:
* WHAT...Cold conditions with temperatures as low as 40.

* WHERE...The Marin Hills, North Bay Interior Mountains, and North
Bay Interior Valleys.

* WHEN...Until 8 AM PST Saturday.

* IMPACTS...Cold conditions will be hazardous to sensitive
populations such as unhoused individuals. Prolonged exposure to the
cold conditions will lead to hypothermia for people, pets, and
livestock. Cold conditions may damage or kill sensitive crops,
plants, and vegetation if appropriate precautions are not taken.

Information:
Cover or tend to sensitive crops, plants, and vegetation.

Ensure portable heaters are working properly and are used correctly
to avoid sparking a fire indoors. Do not use generators or grills
inside as carbon monoxide poisoning can result.

Check with your local, city, or county officials for information on
available warming centers.

Be sure to dress in layers if outdoors. Make sure that pets and
livestock have adequate food, unfrozen water, and warmth. Cover or
tend to sensitive crops, plants, and vegetation.