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Updated:October 10, 2026 12:15 pm PDT

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Napa County

  Effective: Fri, 10/9 3:16pm Severity: Minor
  Updated: October 10, 2026 12:15 pm Urgency: Expected
  Expires: Sat, 10/10 3:00pm Certainty: Likely

Areas Affected: North Bay Interior Valleys
 
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 Pablo Bay.

* WHEN...Until 4 PM PDT Wednesday.

* IMPACTS...Flooding of lots, parks, and roads with only isolated
road closures expected. High tides will result in flooding along
coastal trails, cut off access to some low- lying beaches and
coastal areas, and bring water and waves farther up the beach
than typical. Dangerous conditions are forecast along the
shoreline. Hazards include sneaker waves, strong rip currents,
and large breaking waves.

* ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide
is expected to be 1.4 ft above normal (7.3 ft MLLW) at 11:50 AM
Saturday 10/10, 1.4 ft above normal (7.3 ft MLLW) at 12:18 PM
Sunday 10/11, 1.2 ft above normal (7.1 ft MLLW) at 12:46 PM
Monday 10/12, 1.1 ft above normal (7.0 ft MLLW) at 1:14 PM
Tuesday 10/13, and 0.9 ft above normal (6.7 ft MLLW) at 1:46 PM
Wednesday 10/14. These predictions include up to 1.2 ft of 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.