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Updated:December 1, 2025 8:31 pm PST

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Alameda County

Effective: Mon, 12/1 6:47pm Severity: Minor
Updated: December 1, 2025 8:31 pm Urgency: Expected
Expires: Tue, 12/2 9:30am Certainty: Likely

Areas Affected: North Bay Interior Valleys - San Francisco Bay Shoreline
 
Alert Details:
* WHAT...Up to 1.4 ft of inundation above ground level is
possible in low lying areas near shorelines and tidal
waterways.

* WHERE...Bayshore locations along the San Francisco Bay and San
Pablo Bay.

* WHEN...From 6 AM Tuesday to 3 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 0.8 ft above normal (6.66 ft MLLW) at
8:24 AM Tuesday, 1.2 ft above normal (7.00 ft MLLW) at 9:04 AM
Wednesday, 1.4 ft above normal (7.20 ft MLLW) at 9:48 AM
Thursday, 1.4 ft above normal (7.23 ft MLLW) at 10:35 AM
Friday, 1.2 ft above normal (7.08 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.