136
FXUS66 KEKA 262237 CCA
AFDEKA

AREA FORECAST DISCUSSION...CORRECTED
National Weather Service Eureka CA
237 PM PST Wed Nov 26 2025

.SYNOPSIS...A weakening cold front is expected to bring a chance
for light rain primarily to Del Norte and northern Humboldt counties
on Thanksgiving Day. A cooling trend follows for the weekend with
dry conditions and a chance for freezing temperatures during the
morning hours. Additionally, a long period swell is expected to
bring hazardous beach conditions late Sunday into early next week.

&&

.DISCUSSION...High pressure is forecast to shift eastward as a
shortwave trough and associated surface low moves toward the
PacNW tonight through Thursday (Thanksgiving Day). A weakening
cold front is forecast to move onto the North Coast during the day
on Thursday. A shallow push of moist air with this decaying front
will likely bring some light rain to mostly Del Norte and northern
Humboldt. Per HREF guidance, greatest amounts will be over Del
Norte and far northern Humboldt Counties. Chance for 0.10-0.25
inches in 24 hours ending 4 AM Friday is 60-80% for coastal
portions of Del Norte, 30-40% for coastal northern Humboldt north
of Trinidad and 20-30% for the higher terrain around Humboldt Bay.
Otherwise, generally less a tenth is expected. Now for the bulk
of the forecast area, mostly dry conditions are expected Thu-Fri.

Temperature bottomed out in the lower to mid 30`s for many of the
colder interior valleys early this morning. In southern Trinity,
early morning minimums were in the mid to upper 20`s. Frost and
freeze products have been discontinued for southern Trinity, NE
Mendocino and northern Lake Counties for the remainder of fall and
through the upcoming winter months. Elsewhere, a widespread
killing freeze (at 50% coverage) has not occurred yet and frost
and freezing temperatures continues to be a concern for growers
and those with sensitive plants.

Cloud cover is forecast to increase tonight and will likely hinder
the longwave cooling into early Thu across the area. The air mass
is much warmer, but remains dry. Frost appears less likely tonight
for portions of interior Mendocino, southern Lake and northern
Trinity where a widespread killing freeze has not been recorded
yet. Early morning minimums on Thu will likely vary widely under
a warmer air mass and clouds. Forecast minimum temperature have
been nudged toward persistence (low to mid 30`s) in the interior
valleys. Higher elevations will likely warm up tonight. Any mixing
in the valleys may keep temperatures in the lower to mid 40`s.

Another shortwave trough will drop down from the NW over the
weekend. Current indications are for this trough to take an over
land trajectory as a ridge builds over the Gulf of AK. Potential
for more light precip is not completely out of question just yet.
General consensus is for continued dry weather Fri-Sun. Only about
20% of the cluster means are showing some light rain, while 80%
suggest dry weather. Repetitive frost advisories and/or freeze
warnings will most likely be forthcoming over the next several
nights and early mornings as this trough reinforces the dry
offshore flow over the area. Another inside slider type trough is
expected early to mid next week. This trough may bring a greater
chance for blustery north and northeast winds by mid week. Once
again there is a range of possible outcomes, however the overall
blocking pattern suggest predominately dry weather only with a
10-20% chance for fleeting precipitation for Del Norte and
Trinity Counties.

&&

.AVIATION...(18Z TAFS)...VFR conditions will continue for terminals
in Northwest California until this evening. High clouds will begin
moving into the area this evening ahead of a weak cold front that`ll
clip the northern areas of the CWA. MVFR ceilings could occur for
Del Norte and northern Humboldt terminals by late Thursday morning
and into the afternoon. Light rain is possible for these same areas
Thursday afternoon and into Thursday evening. /JLW

&&

.MARINE...Relatively calm conditions with light to gentle breezes
and seas up to 5 feet will continue through today. Winds continue to
shift southerly north of Cape Mendocino this afternoon as a weak
frontal boundary approaches. Southerly winds are expected to
increase to around 10 to 15 kt across the northern outer waters late
tonight and into Thursday. Northerly winds are forecast to redevelop
Thursday afternoon in the wake of the front, before strengthening on
Friday. Models suggests the strongest winds will be south of Cape
Mendocino, with potential gusts up to 25 kts. For the weekend,
northerly winds are anticipated to expand northward with gusts up to
around 30 kts across the outer waters by Sunday.

A forerunner mid-period WNW swell around 8 to 12 feet at 12 seconds
will build in on Thursday. Wind waves around 6 to 9 feet at 8 seconds
expected on Sunday. /ZVS

&&

.BEACH HAZARDS...A W-NW swell around with periods from 18-22
seconds will move through the waters Sunday evening through
Monday, resulting in building surf along the beaches and increasing
the potential of sneaker waves. Breaking waves will increase
Sunday evening into Monday morning, reaching 14 feet by Monday
morning along the northwest facing beaches. Sneaker waves are a
unique hazard, with many minutes between waves. Pay attention and
stay above the high water line and any wet sand to stay safe. If
the ground is wet, waves have surged there recently. Stay safe and
never turn your back on the ocean! /ZVS

&&


.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Frost Advisory from 2 AM to 9 AM PST Thursday for CAZ107-
     110-112-113-115.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory from 3 PM Thursday to 9 AM PST Friday
     for PZZ450-470.

     Small Craft Advisory from 11 PM Thursday to 9 AM PST Friday
     for PZZ455-475.

&&

$$

NOTE: The full forecast discussion is now regularly issued between
10 am/pm and 1 pm/am. Additional updates will be issued as needed.

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https://www.weather.gov/images/eka/zonemap.png