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Updated:November 6, 2025 9:31 pm PST

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Napa County

  Effective: Thu, 11/6 5:06pm Severity: Minor
  Updated: November 6, 2025 9:31 pm Urgency: Expected
  Expires: Fri, 11/7 5:00am Certainty: Likely

Areas Affected: North Bay Interior Valleys - San Francisco Bay Shoreline
 
Alert Details:
* WHAT...Up to 1.2 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 8 AM Tuesday to 2 PM PST Saturday.

* 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 1.1 ft above normal (7.0 ft MLLW) at 11:42 AM
Friday, and 0.9 ft above normal (6.7 ft MLLW) at 12:31 PM
Saturday. High tide timing varies up to 90 minutes earlier or
later along the coast and throughout the 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.