700
FXUS66 KEKA 300941
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
141 AM PST Fri Jan 30 2026

.SYNOPSIS...A few more days of mild weather continue before a
colder spell towards the end of the weekend. Precipitation chances
have retreated for most areas. Coastal flooding is possible
Saturday with the high tide and low end anomaly.


&&

.DISCUSSION...Quiet weather conditions prevail across NW California
as an upper-level blocking flow pattern promotes dry and mild weather
conditions. Daytime temperatures have been generally in the upper
50s to mid 60s, with similar effects through Saturday. We will see
a cooler pattern emerging Sunday as the offshore low approaches
the CWA. Increasing high- level moisture is expected as weak
shortwave embedded in the southwest- westerly flow moves toward
OR/WA. Otherwise, dry and mild weather conditions prevailing over
NW California as the main ridge gradually amplifies over the West
Coast into the weekend. Some moderate southerly breezes are
expected to developed over the interior higher terrain. Overnight
temperatures are forecast to be in the upper 30s to mid 40s along
the interior valleys. Patchy fog and low clouds will likely form
again in the valleys Friday morning, especially in Trinity,
Humboldt and interior Mendocino. Friday and Saturday afternoon
temperatures are expected to be slightly warmer similar compared
with today, with highs mainly in the 60s, especially on Saturday.

Over the weekend, an broad upper level trough approaches the Pacific
Northwest, and the high pressure shift eastward. A shortwave trough
and cold front embedded to the trough will approaches the area Saturday
night through Sunday. A cold front will traverse the northern portion
of the area from west-northwest on Sunday. A faster scenario suggests
rain arriving earlier, Saturday night. Multi- model ensemble (NBM
QMD) continues to indicate a 40-65% chance for 0.25 inches or more
in 24 hours ending 4 PM or 10 PM Sunday for mainly the northern
zones, especially Del Norte and Humboldt counties. There is up to
15% chance for 1" in 24 hours over Del Norte mountains and SW Humboldt
(King Range) for the same 24 hour time periods. Generally lighter
amounts of rain are forecast for eastern valleys of Trinity and
northern Mendocino where chances for 0.10 inches in 24 hours are
around 20-45% ending 10 PM Sunday. Snow levels appear quite high
when most of the precip arrives, generally above 6kt on Sunday,
lowering to 5kft in the cooler air after frontal passage by Monday
morning.

Lingering showers will be possible on Monday before a ridge aloft
amplifies and northerly to northeasterly surface flow develops
and we stay dry for a day or two and perhaps most of next week.
/ZVS /EYS



&&

.AVIATION...Light offshore flow has continued to promote VFR
conditions all across the area this evening with broken clouds
around 15 kft being the only notable feature. There is again very
slight potential (20% chance) of fog around Ukiah near sunrise, but
overall probability is low. Otherwise, VFR conditions will persist
through the day Friday. /JHW


&&

.MARINE...Currently gentle southerly winds throughout the waters
will persist until Saturday with only very isolated gusts over 20
kts in the far outer waters. That said, a persistent series of long
period westerly swells will maintain a steep sea state. Combined
seas will most likely barely drop below 10 feet Friday, but another
westerly swell will build in and keep seas no shorter than about 8
feet into the weekend. Sea will most likely very briefly calm
Saturday night into Sunday, but a weak front crossing the area
Sunday will rebuild steep short period seas at least for the
northern waters. Yet another round of steep, long period swells will
build behind the front Sunday once again building over 10 feet into
early next week. /JHW


&&

.COASTAL FLOODING...A high astronomical tide accompanied with
a slight anomaly, will bring the threat of flooding to low lying
areas around Humboldt bay on Saturday January 31st. A CF.Y
(Coastal Flood Advisory) has been hoisted for Saturday from 8am to
noon, with the peak expected around 10am. Friday forecasts for
tide and anomaly are just under the criteria for a Coastal Flood
Advisory.



&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Coastal Flood Advisory from 8 AM to noon PST Saturday for
     CAZ103.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Coastal Flood Advisory from 8 AM to noon PST Saturday for
     PZZ415.

     Small Craft Advisory until 3 AM PST early this morning for
     PZZ450-455-475.

     Small Craft Advisory until 9 PM PST this evening 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