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Updated:June 12, 2026 12:15 pm PDT

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Napa County

  Effective: Fri, 6/12 11:55am Severity: Minor
  Updated: June 12, 2026 12:15 pm Urgency: Expected
  Expires: Fri, 6/12 8:00pm Certainty: Likely

Areas Affected: North Bay Interior Valleys - San Francisco Bay Shoreline
 
Alert Details:
* WHAT...Up to 2.0 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal waterways.

* WHERE...Low-lying bayshore regions along the San Francisco and
San Pablo Bays.

* WHEN...Until 3 AM PDT Wednesday.

* 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 1.7 ft above normal (7.6 ft MLLW) at 9:34 PM
on Friday the 12th, 1.9 ft above normal (7.8 ft MLLW) at 10:20
PM on Saturday the 13th, 2.0 ft above normal (7.8 ft MLLW) at
11:10 PM on Sunday the 14th, 1.9 ft above normal (7.8 ft MLLW)
at 12:02 AM on Tuesday the 16th, and 1.6 ft above normal (7.4
ft MLLW) at 12:56 AM on Wednesday the 17th. 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.