008
FXUS66 KEKA 222307
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
307 PM PST Sat Nov 22 2025

.SYNOPSIS...Another cold night is in store as clear skies persist. A
marine layer will likely build along the coast early Sunday with
coastal drizzle by the evening. Cool and dry weather will return
Monday and Tuesday.


&&

.DISCUSSION...

WEATHER PATTERN OVERVIEW: Clear skies overnight promoted cold
conditions. Just enough fog formed near shore to prevent widespread
frost, but many interior valleys saw near freezing conditions
despite low cloud and fog formation. Very similar conditions will be
expected tonight for far interior locations with lows in the mid 30s
once gain, though valley fog will continue to make true frost
formation patchy at lower elevations.

Winds quickly turning onshore ahead of a weak trough passage to the
north will most likely promote a coastal marine layer to form early
Sunday morning. The marine layer lifting through the day may allow
for light rain and drizzle just along the immediate coast Sunday
afternoon and evening. Rain chances are greatest in Crescent City
where there is a 25% chance of wetting rain (> 0.1 inches) and a 90%
chance of at least light drizzle. Chances drop by Humboldt  Bay
where there is only a 50% chance of even light drizzle.

Clearer skies and offshore flow will quickly reassert themselves
early next week with another 50% chance of light frost in the
interior by Monday morning. Most ensemble members continue to show a
cold, cutoff low pressure system impacting the area mid to late next
week, though potential timing is very uncertain. At least some rain
is very likely, but the range is large (most likely 0.5 to 2.0
inches) because many models focus the system north. Compared to
previous model runs, more now show the system staying north of the
area (about 50%). Should rain occur, it will focus on the North
Coast. NBM shows snow levels of 3000 to 4500 feet on the back end of
the system into next weekend, which could bring some of the lowest
elevation (albeit very light) snow of the season so far. There is
little ensemble support (less than 20% over 45 mph) of any impactful
winds with the system. /JHW



&&

.AVIATION...(18Z TAFs)...Northwesterly winds have filled in as of
18-19z with VFR conditions expected to prevailing at the coastal
terminals. A reduction in visibility from haze/mist at KCEC and KACV
brought periods of MVFR/IFR late this morning and could return at
intermittent intervals later tonight as cloud cover fills in and
ceilings lower. There is a 50% probability that ceilings will be
less than 6500ft before midnight at KCEC and 56-60% for KACV. Cloud
cover will likely begin to fill in before midnight as well. Look for
light rain or drizzle tomorrow by the late afternoon as the marine
layer lifts for KCEC and to a less of a chance at KACV with only a
50% chance of light drizzle for the Humboldt bay area, as mentioned
in the general discussion. /EYS


&&

.MARINE...Northerly winds continue at a moderate rate for the
Northern waters and a few knots higher in the Southern waters this
afternoon but will build as the fetch moves south. Small Craft
Advisory still remains in place for all area waters through the end
of the weekend with gusts of 20-30 kts in the Southern outer waters,
peaking tonight. Seas remain elevated as steep wind waves combine
with large long period WNW swells. Combined seas may reach 12-15 ft
this afternoon and evening. Winds ease Sunday as a weak front passes
through the area, but northerly winds return behind the front Sunday
night into Monday. Combined seas may temporarily drop below 10 ft
Sunday night, but are forecast to exceed 10 ft again as winds build.
Milder conditions return by Tuesday evening and continue through
midweek. /JB /EYS


&&

.BEACH HAZARDS...A series of long-period WNW swells will fill in
starting Saturday morning. These will pose a moderate risk of
sneaker waves through the day Saturday and Sunday. Breaking wave
heights may reach 17-19 ft. Be cautious visiting beaches and jetties
and remember to never turn your back to the ocean!


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Beach Hazards Statement through Sunday evening for CAZ101-
     103-104-109.

     Frost Advisory from 2 AM to 9 AM PST Sunday for CAZ103-
     106>108-110-111.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until noon PST Sunday for PZZ450.

     Small Craft Advisory until 6 PM PST Sunday for PZZ455-475.

     Small Craft Advisory until 11 PM PST Sunday for PZZ470.

&&

$$

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