489
FXUS66 KEKA 110958
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
158 AM PST Thu Dec 11 2025

.SYNOPSIS...Generally dry weather and above seasonably temperatures
through this weekend, especially across the interior. Moderate
risk of sneaker waves along NW California beaches today. Wet
weather conditions returns early to mid next week.


&&

.DISCUSSION...This evening, areas of fog and patchy dense fog are
expected to redevelop again, especially along the North Coast and
some interior valleys in Humboldt and Trinity counties. A dense
fog advisory has been issued for coastal Humboldt Co through 11am
due to visibilities at, or under, 1/4mi being observed. Fog is
also expected through the morning for coastal valleys of the Eel,
Trinity, Klamath, and possibly the Russian River. Overnight
temperatures are forecast to be generally in the 40s, but in the
low to mid 30s for the coldest valleys in Trinity, interior
Mendocino and Lake counties where skies are clear.

Ridging remains dominant and strengthening off the West Coast
today and Friday, promoting dry weather and warming trend pattern.
High temperatures will remain 10-20F above the seasonal average.
The offshore flow regimen (easterly winds) is anticipated to
increase tonight into Friday, keeping the air dry and reinforce
the warming trend. NBM probability for high temperatures exceeding
75F around Ukiah shows a 45% on Thursday and increases to 55% on
Friday. See Climate section below. Even the coastal areas are
expected to warm up to mid 60s on Friday, before seas breezes
develop.

Over the weekend, the ridge begin to show signs of weakening and
shifting eastward. Confidence in the forecast remains high for
dry weather through the weekend and into Monday next week.
Temperatures will see a minor fluctuations, generally remaining
above normal for this time of year.

Heading to next week, high pressure breakdown and shift eastward,
while an upper level trough develop over the Gulf of Alaska.
A series of shortwave and frontal system embedded to the trough
moving north of the area will bring increasing chance of
precipitation early to mid next week. Ensemble and operational
models are in a better agreement with wet weather conditions
returning as early as Monday for the northern portion of the
forecast area, with increasing chance of precipitation for
Mendocino and Lake counties Monday night/Tuesday. Light rainfall
is most likely expected with the frontal system moving across the
area Monday into Tuesday. Stay tuned! /ZVS


&&

.AVIATION...(06z TAFs)...Prevailing LIFR conditions along the
coastal terminals, with ceilings around 200 feet and visibility in
fg/br. A period of variable conditions are expected again during
the morning and early afternoon hours, before sea breezes develop
and remain the ACV and CEC terminals in LIFR conditions. Gentle
offs shore flow is expected to develop over the interior higher
terrain tonight into Friday. However, short-term guidance suggest
prevailing LIFR conditions with fog in 1/4SM. Meanwhile,
prevailing VFR conditions are expected at UKI through the TAF
period. Winds will remain very light and terrain-driven at all TAF
terminals.


&&

.MARINE...Gentle to fresh northerly winds across the waters, with
the strongest winds downwind Cape Mendocino. Surface pressure
gradient is expected to gradually tighten today. Northerly winds
will continue to strengthening to moderate to strong northerly
winds south of Cape Mendocino through this evening, while gentle
winds increases to moderate breezes across the northern waters.
Gusts up to around 34 kts are likely in the fan of Cape Mendocino
late this afternoon and early evening. Building short-period wind
waves will combine with a fresh westerly swell to create steep,
hazardous seas for small crafts. This chaotic sea state will
expand into the northern outer waters early Friday. Conditions are
expected to improve this weekend as high pressure weakens and
winds shift southerly. /ZVS


&&

...CLIMATE...
Daily Records (December 11)

Station/Forecast/Record/Date
-------/--------/------/----
KEKA      58      69   1973
KCEC      58      72   1951
KUKI      75      78   1958
----------------------------
*(Potential Tied or Broken Record)

Daily Records (December 12)

Station/Forecast/Record/Date
-------/--------/------/----
KEKA      61      70   1944
KCEC      69      68   1988
KUKI     *75      72   1958
----------------------------
*(Potential Tied or Broken Record)


&&

.BEACH HAZARDS...A Beach Hazard Statement is in effect from
10am this morning through 7pm this evening due to a moderate risk
of sneaker waves along areas beaches. A mid-period westerly swell
will build across the coastal waters tonight, with heights at 8-9
feet at 14 seconds. These high energy waves will bring a moderate
risk of sneaker waves today, resulting in the potential deadly
waves that unexpectedly surge much farther up the beach than
previous waves, overtaking unaware beachgoers. Remember to never
turn your back to the ocean, and to avoid steep beaches, jetties,
outcroppings, and rocks during these events./ZVS


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Beach Hazards Statement from 10 AM PST Thursday through
     Thursday evening for CAZ101-103-104-109.

     Dense Fog Advisory until 10 AM PST Thursday for CAZ103-106.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Dense Fog Advisory until 10 AM PST Thursday for PZZ415.

     Small Craft Advisory until 3 AM PST Friday for PZZ455.

     Small Craft Advisory from 3 AM to 3 PM PST Friday for
     PZZ470.

     Small Craft Advisory until 3 PM PST Friday for PZZ475.

&&

$$

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

Visit us at https://www.weather.gov/eureka

Follow us on Facebook and Twitter at:
https://www.facebook.com/NWSEureka
https://www.twitter.com/NWSEureka

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