631
FXUS66 KEKA 280833
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1233 AM PST Fri Nov 28 2025

.SYNOPSIS...Coastal areas will experience mostly cloudy skies and
bouts of drizzle through this morning, primarily for Del Norte
and northern Humboldt. Otherwise, dry and seasonably cool weather
is forecast for the next 7 days. A highly energetic long period
west swell will bring an increased risk for hazardous beach
conditions Monday through Tuesday next week.


&&

.DISCUSSION...A weak cold front continues shifting east-southeast
and exiting the forecast area. This brought light rainfall and
sprinkles, especially for Del Norte and northern Humboldt
counties. A deep saturated layer will continue to promote drizzle
along the North Coast through this morning. Areas of valley low
clouds and fog have developed overnight with a strong radiational
cooling. This low clouds area expected top slowly lift throughout
the day, with high clouds spread across the area by the
afternoon. Northwesterly flow aloft occurring downstream from the
ridge will favor dry weather and seasonably temperatures over NRN
California. High temperatures are forecast to be generally in the
mid 50s to mid 60s.

While ridging continues to build over the Gulf of Alaska, an
approaching closed low near 40N/130W will drift southward well
offshore the California Coast through the weekend. Another
shortwave trough will swoop down across the Pacific NW into the
Great Basin over the weekend. Otherwise, dry and seasonably high
temperatures is expected. Breezy northerly winds is expected to
developed along the coastal headlands and exposed ridges on
Sunday. Offshore winds are expected to develop over the higher
terrain across the interior Sunday evening and increase into
Monday morning, with the strongest winds anticipated over the
eastern portion of Lake County where gusts up to 35 mph are
possible. Overnight frost and freezing morning temperatures will
once again be prime concern for those with sensitive plants. /ZVS

...EXTENDED DISCUSSION...(Tuesday through Friday)...
Above normal 500mb heights will most likely (80% chance) keep
much of Northwest California in a long stretch of dry weather all
next week. However, a third shortwave trough may (18% chance)
generate fleeting showers for Del Norte and mountains of Trinity
on Tuesday. This second insider slider trough will carve out a
larger scale trough that will promote blustery N and NE winds
around mid week. With lower dew points, calm winds in the valleys,
clear skies and long nights, the threat for frost or freezing
temperatures will once again crop up. A killing freeze has already
occurred multiple times in Trinity, northern interior Mendocino
and northern Lake Counties. We have suspended issuing frost and
freeze products for these areas until spring. Cold weather
products for wind chill may be necessary if an unseasonably cold
air mass settles over the area around mid next week. There are
subtle signs of omega block break down or a westward shift in the
longwave the following weekend of Dec 6-7 and consequential precip
will be possible. /DUG



&&

.AVIATION...A weak passing cold front generated periods
of light, shallow rain along the coast through the evening hours.
Further rain is unlikely through the night, but lingering moisture
has created IFR fog in some locations along the coast, especially
round Humboldt Bay. IFR visibilities will gradually decrease into
the morning, with most models showing clearing to MVFR (90% chance)
quickly by sunrise. There is model disagreement during the day. Most
(70%) showing ceilings scattering to VFR but a minority show some
ceilings persisting through the day. Similar disagreement is evident
Friday evening as well with a solid 30% of models showing a shallow
IFr marine layers but the rest staying more clear along the coast.
Otherwise, widespread valley fog will most likely continue to effect
the interior during the overnight and morning hours into the
weekend. /JHW


&&

.MARINE...Weak northerly winds have quickly built throughout the
waters behind a passing cold front. The sea state is currently
controlled by a mid period westerly swell around 10 feet, leading to
moderately steep seas. This swell will quickly decay through the day
Friday with mostly calm conditions headed into early Saturday.

Another mid period westerly swell will begin to build Saturday night
into Sunday, again bringing mostly mild seas up to around 8 feet.
Northerly winds will increase in the outer waters through the day
Sunday, especially south of Cape Mendocino, with some gusts near 30
kts. Winds and steep short period seas, however, will most likely
remain far from shore with much calmer conditions in the inner
waters.

Similar northerly winds will continue in the outer waters early next
week. A long period westerly swell up to 12 feet will begin to
impact the waters Monday into Tuesday. Around the same time,
northerly winds will most likely push closer to shore with potential
(40% chance) for solid gale force conditions around midweek. /JHW


&&

.BEACH HAZARDS...A series of mid period westerly swells will
continue to impact the waters through the weekend. The next swell
will build up to 8 feet at 14 seconds beginning Saturday afternoon
into Sunday. With mostly calm short period seas, the forerunners of
this swell especially will pose a moderate sneaker wave risk
Saturday evening with unexpected and inconsistent surf on area
beaches. A second sneaker wave risk is possible as longer period
swell builds Monday into Tuesday, but the overall risk of this swell
is more uncertain due to the potential for short period seas to push
closer to shore around the same time. In any case, the swell will
increase surf and make local beaches more hazardous. /JHW


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 9 AM PST Friday for PZZ450-470.

     Small Craft Advisory until 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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For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.png