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Updated:December 30, 2025 10:30 pm PST

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Contra Costa County

Effective: Tue, 12/30 2:08pm Severity: Minor
Updated: December 30, 2025 10:30 pm Urgency: Expected
Expires: Wed, 12/31 5:00am Certainty: Likely

Areas Affected: San Francisco - Coastal North Bay Including Point Reyes National Seashore - North Bay Interior Valleys - San Francisco Bay Shoreline - San Francisco Peninsula Coast - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast
 
Alert Details:
* WHAT...Up to 1.8 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways.

* WHERE...San Francisco Bay and San Pablo Bay shoreline,
Monterey Bay shoreline, and the Pacific Coast.

* WHEN...From 5 AM Wednesday to 2 PM PST Sunday.

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

* ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide
is expected to be:
1.5 ft above normal (7.36 ft MLLW) at 7:51 AM Wednesday 12/31
1.7 ft above normal (7.55 ft MLLW) at 8:41 AM Thursday 1/1
1.8 ft above normal (7.66 ft MLLW) at 9:34 AM Friday 1/2
1.8 ft above normal (7.63 ft MLLW) at 10:26 AM Saturday 1/3
1.6 ft above normal (7.42 ft MLLW) at 11:18 AM Sunday 1/4
These predictions include 0.5 feet of storm surge that will
enhance the astronomical tide and flooding threat. High tide
varies up to 90 minutes earlier or later along the Pacific
Coast and through 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.