Coastal Flood Advisory
Coastal Hazard Message
National Weather Service Eureka CA
652 AM PST Thu Dec 4 2025
CAZ103-042000-
/O.CON.KEKA.CF.Y.0009.251204T1700Z-251204T2000Z/
Northern Humboldt Coast-
652 AM PST Thu Dec 4 2025
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL NOON PST
TODAY...
* 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 expected near
shorelines and tidal waterways. Between 9 and 9.3 feet MLLW at
the North Spit tide gauge is predicted.
* WHERE...Northern Humboldt Coast County.
* WHEN...From 9 AM to noon PST Thursday. High tide is at 10:08am
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.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
&&
$$
Coastal Hazard Message
National Weather Service San Francisco CA
504 AM PST Thu Dec 4 2025
CAZ006-506-508-529-530-050500-
/O.CON.KMTR.CF.Y.0016.000000T0000Z-251207T2300Z/
San Francisco-North Bay Interior Valleys-
San Francisco Bay Shoreline-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
504 AM PST Thu Dec 4 2025
...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 3 PM PST
SUNDAY...
* WHAT...Up to 1.4 ft of inundation above ground level is
possible in low lying areas near shorelines and tidal
waterways.
* WHERE...Bayshore locations along San Francisco and Monterey
Bay.
* WHEN...Until 3 PM PST Sunday.
* IMPACTS...Flooding of lots, parks, and roads with only
isolated road closures expected.
* ADDITIONAL DETAILS...For the Coastal Flood Advisory, at the
San Francisco tidal gauge high tide is expected to be 1.2 ft
above normal (7.00 ft MLLW) at 9:04 AM Wednesday, 1.4 ft above
normal (7.20 ft MLLW) at 9:48 AM Thursday, 1.4 ft above normal
(7.23 ft MLLW) at 10:35 AM Friday, 1.2 ft above normal (7.08
ft MLLW) at 11:25 AM Saturday, and 0.9 ft above normal (6.75
ft MLLW) at 12:17 PM Sunday. High tide timing varies up to 90
minutes earlier or later along the Pacific Coast and
throughout the San Francisco Bay respectively.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.
&&
$$
Small Craft Advisory
URGENT - MARINE WEATHER MESSAGE
National Weather Service Eureka CA
1020 AM PST Thu Dec 4 2025
PZZ470-042300-
/O.CON.KEKA.SC.Y.0131.000000T0000Z-251204T2300Z/
Pt St George to Cape Mendocino 10 to 60 nm-
1020 AM PST Thu Dec 4 2025
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 3 PM PST THIS
AFTERNOON...
* WHAT...North winds around 15 kt and seas around 7 feet.
* WHERE...Pt St George to Cape Mendocino 10 to 60 nm.
* WHEN...Until 3 PM PST this afternoon.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service Eureka CA
1020 AM PST Thu Dec 4 2025
PZZ475-050230-
/O.CON.KEKA.SC.Y.0131.000000T0000Z-251205T2200Z/
Cape Mendocino to Pt Arena 10 to 60 nm-
1020 AM PST Thu Dec 4 2025
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 2 PM PST FRIDAY...
* WHAT...North winds 10 to 20 kt with gusts up to 30 kt and seas
5 to 8 feet.
* WHERE...Cape Mendocino to Pt Arena 10 to 60 nm.
* WHEN...Until 2 PM PST Friday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service San Francisco Bay Area
816 AM PST Thu Dec 4 2025
PZZ540-050030-
/O.CON.KMTR.SC.Y.0212.251205T1700Z-251206T1100Z/
Coastal Waters from Point Arena to Point Reyes California out to
10 NM-
816 AM PST Thu Dec 4 2025
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 AM FRIDAY TO
3 AM PST SATURDAY...
* WHAT...Northwest winds 10 to 20 kt with gusts up to 30 kt
expected.
* WHERE...Coastal Waters from Point Arena to Point Reyes
California out to 10 NM.
* WHEN...From 9 AM Friday to 3 AM PST Saturday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
For more information from the National Weather Service visit
http://weather.gov/sanfrancisco
URGENT - MARINE WEATHER MESSAGE
National Weather Service San Francisco Bay Area
816 AM PST Thu Dec 4 2025
PZZ570-050030-
/O.CON.KMTR.SC.Y.0212.251205T0500Z-251206T1100Z/
Waters from Point Arena to Point Reyes 10-60 NM-
816 AM PST Thu Dec 4 2025
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING
TO 3 AM PST SATURDAY...
* WHAT...Northwest winds 15 to 25 kt with gusts up to 30 kt
expected.
* WHERE...Waters from Point Arena to Point Reyes 10-60 NM.
* WHEN...From 9 PM this evening to 3 AM PST Saturday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service San Francisco Bay Area
816 AM PST Thu Dec 4 2025
PZZ571-050030-
/O.CON.KMTR.SC.Y.0212.251205T0500Z-251206T1100Z/
Waters from Point Reyes to Pigeon Point 10-60 NM-
816 AM PST Thu Dec 4 2025
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 9 PM THIS EVENING
TO 3 AM PST SATURDAY...
* WHAT...Northwest winds 15 to 25 kt with gusts up to 30 kt
expected.
* WHERE...Waters from Point Reyes to Pigeon Point 10-60 NM.
* WHEN...From 9 PM this evening to 3 AM PST Saturday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
URGENT - MARINE WEATHER MESSAGE
National Weather Service San Francisco Bay Area
816 AM PST Thu Dec 4 2025
PZZ575-050030-
/O.CON.KMTR.SC.Y.0212.251205T1100Z-251206T1100Z/
Waters from Pigeon Point to Point Pinos 10-60 NM-
816 AM PST Thu Dec 4 2025
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 3 AM FRIDAY TO
3 AM PST SATURDAY...
* WHAT...North winds 15 to 25 kt with gusts up to 30 kt expected.
* WHERE...Waters from Pigeon Point to Point Pinos 10-60 NM.
* WHEN...From 3 AM Friday to 3 AM PST Saturday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
