Arcata, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

618
FXUS66 KEKA 071057
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
357 AM PDT Mon Apr 7 2025

.SYNOPSIS...Occasional light rain showers continue today. Additional
light rain and breezy south wind in Del Norte Tuesday. Warm and dry
weather returns to the interior midweek.


&&

.DISCUSSION...An area of low pressure continues to spin off the
coast of Oregon early this morning. Occasional rain showers continue
today as the low moves onshore. Snow levels drop behind the low
this morning to around 5000-6000 ft, which could bring a rain/snow
mix to Highway 3 at Scott Mountain Pass if any showers pass
through. Another shortwave passes to our north Tuesday, which
brings a chance of light rain primarily for Del Norte. NBM
probabilities for a 0.1 inch Tuesday is around 30-40% for much of
Del Norte and probabilities are much lower to the south. Breezy
winds of up to 35 mph are possible for exposed ridges and coastal
headlands of Del Norte Tuesday. Outside Del Norte, high dew points
will bring areas of valley fog Tuesday, which will also reduce the
risk of a widespread frost or freeze. NBM probabilities for
temperatures lower than 36 is less than 20% in all valleys outside
Trinity county.

Ridging builds in midweek, bringing warm, sunny weather to the
interior. The NBM probabilities for 80s are 30-40% for some valleys
including Weaverville, Hayfork, Covelo, Ukiah, and Middletown.
Another shortwave moves in Friday, which likely only brings some
cloud cover to the area. The chance for any measurable
precipitation is highest in Del Norte at around 50%, with much
lower probabilities to the south. Ensembles diverge into the
weekend, with a roughly 50/50 split between ridging and troughing,
though no significant systems are obvious on the horizon. JB


&&

.AVIATION...Precipitation has been diminishing overnight with
periodic IFR ceilings and visibilities in mist and low clouds.
IR satellite imagery showed another cloud feature extending
southward from a cyclonic circulation west Cape Blanco early this
morning. High resolution models and HREF mean indicate light precip
increasing again this morning as this feature intersects the coastal
terrain. The light precip will most likely result in continued IFR
for the coastal terminals. Confidence coastal terminals will improve
today is not high. Expect MVFR conditions. High humidity and moist
ground will probably lead to IFR in mist and/or low clouds. S-SW
winds remain gusty at KCEC, 22-30kt til 07/18Z, decreasing this
afternoon and evening. Gusty conditions return with approach of
another trough line after 08/06z. DB


&&

.MARINE...SW winds early this morning north of Cape Mendo diminish
today. Another trough expected to bring another increase in SW wind
late tonight into Tue. Strongest winds near Pt St George with
possible gusts to 30 kt. Winds go light and NW on Wed. Another
trough approaches Thu, south winds generally on the light side.
North to northwest winds strengthen on Friday. Seas expected to
remain hazardous around 10 feet today due to a combo of westerly
swell and short period SW waves. A secondary reinforcement of the
westerly swell will arrive late this afternoon and evening and seas
will probably remain elevated and hazardous near 10 ft. Gentle to
moderate northwest winds and lower steep seas expected on Wednesday.
Southerly winds to return on Thursday, but is not looking like a
major storm at this point. Stronger northerlies and steeper NW waves
on Friday will likely become hazardous for inexperienced mariners.
Gale force northerlies possible over the weekend. DB


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 3 PM PDT this afternoon for
     PZZ450-455.

     Small Craft Advisory until 4 PM PDT Tuesday for PZZ470.

     Small Craft Advisory until 3 AM PDT Tuesday for PZZ475.

&&

$$

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