Whitethorn, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

567
FXUS66 KEKA 061002
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
202 AM PST Sat Dec 6 2025

.SYNOPSIS...Light rain possible for Humboldt and Del Norte late
through the weekend into early next week. King tides combined
with tidal anomaly will continue to bring the threat of coastal
flooding in low- lying areas around Humboldt Bay Saturday. A
series of frontal systems moving north of the area will bring a
chance of light rain across the northern portion of the area
through the weekend.



&&

.DISCUSSION...Dense fog developed Friday evening as radiational
cooling had a few hours of activity. Similar behavior is possible
Saturday morning with moisture being deposited from stratiform
saturated profiles near ground. The deep marine layer lifted as
the cold front approached as prefaced by the previous forecasts.
Light rain/drizzle is expected to continue into early next week.

High pressure continues to slowly weakening and "flattening",
while a series of shortwaves trough and frontal systems embedded
to the Aleutian Low continues to move toward the Pacific Northwest
this weekend. Northwest flow aloft will bring additional light
showers across Del Norte and Humboldt counties on Saturday. On
Sunday, another shortwave and frontal system is expected to move
north of our area. The flow aloft will become more zonal, bringing
additional chances of light rain across the northern portion,
especially for Del Norte and northern Humboldt counties.
Elsewhere, partly to mostly cloud skies is expected to continue.

The 500 mb ridge appears to slowly build back early next through
mid next week. WPC ensemble clusters do show about an even split
(50%) of clusters that are "drier" (at least for the North Coast)
than the grand ensemble mean. The ensemble mean is by no stretch
very wet with 0.10-0.25 inches of rain in 24 hours everyday from
Monday through Wednesday, mostly for Del Norte. It could be wet
or it could be dry or both. Stay tuned. -ZVS /EYS



&&

.AVIATION...(06Z TAFS)...A front will continue through Northwest
California early Saturday morning. Most of the drizzle and light
rain has moved through the area, but IFR/LIFR ceilings will continue
for coastal terminals of Humboldt and Del Norte counties.
Southeast flow ahead of another frontal passage to the north may
aide in lifting ceilings and visibilities around sunrise. For
areas to the south and east, including UKI, only a few high clouds
are expected with generally light winds. There is around a slight
chance for MVFR stratus impacts early Saturday to around sunrise
at UKI Saturday. Any low clouds and fog will lift and scatter
shortly after sunrise. JB


&&

.MARINE...Winds and seas continue to ease north of Cape Mendocino as
a weak front moves through the area. Winds and steep seas will
continue to ease early Saturday morning. Generally light winds are
forecast this weekend, with south winds forecast north of Cape
Mendocino and west-northwest winds forecast south of the Cape.
Despite light winds, seas will elevate as a mid-period northwest
swell fills in Saturday. This will peak at around 7-9 ft at 12
seconds. Wave heights peak Saturday night and early Sunday morning,
and combined seas could briefly reach or exceed 10 ft. Seas subside
Sunday and Monday as this swell decays. Light winds continue into
early next week, but seas will remain elevated as a series of mid-
period northwest swells fill in from systems to the north. JB

&&


.COASTAL FLOODING...King tides are predicted to continue this
weekend. High tides are forecast to be at 8.63 feet at the North
Spit tide gauge at around 11:44 AM local time. High tides
combined with surge and tidal anomaly will result in water levels
between 8.9 to 9.2 feet MLLW (Mean Lower Low Water). Minor
coastal flooding around Humboldt Bay, including King Salmon and
Jackson Ranch Road in the Arcata Bottoms, will be likely between
10 AM and 1 PM. A Coastal Flooding Advisory will be in effect
from 10 AM to 1 PM on Saturday. High tides are predicted to be at
8.24 feet at 12:35 PM on Sunday. At this point, coastal flooding
looks marginal for Sunday with high tides diminishing. -ZVS


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Coastal Flood Advisory from 10 AM this morning to 1 PM PST
     this afternoon for CAZ103.

NORTHWEST CALIFORNIA COASTAL WATERS...
     Coastal Flood Advisory from 10 AM this morning to 1 PM PST
     this afternoon for PZZ415.

&&

$$

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