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Updated:December 4, 2025 9:01 pm PST

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Humboldt County

Effective: Thu, 12/4 8:15pm Severity: Minor
Updated: December 4, 2025 9:01 pm Urgency: Expected
Expires: Fri, 12/5 4:15am Certainty: Likely

Areas Affected: Northern Humboldt Coast
 
Alert Details:
* WHAT...High astronomical tides will cause minor flooding in low
lying areas around Humboldt Bay. Up to one half foot of
saltwater inundation above ground level is possible near
shorelines and tidal waterways. Between 9.1 and 9.3 feet MLLW
at the North Spit tide gauge is predicted.

* WHERE...Northern Humboldt Coast County.

* WHEN...From 10 AM to noon PST Friday. High tide is at 10:55 AM
at the Humboldt Bay North Spit tide gauge. Saltwater inundation
will be possible 1 to 2 hours before and after high tide.

* IMPACTS...Flooding of low lying areas around Humboldt Bay
including parks and roads with only isolated closures expected.
Flooding will likely impact Jackson Ranch Road in the Arcata
Bottoms and several roads in King Salmon.

Information:
A Coastal Flood Advisory indicates that onshore winds and tides
will combine to generate flooding of low areas along the shore.

Feet Above Ground is locally defined as feet above the Highest
Astronomical Tide or HAT.