826
FXUS66 KEKA 240708
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1208 AM PDT Fri Apr 24 2026

.SYNOPSIS...Isolated showers and thunderstorms are possible in the
interior this afternoon. There are additional shower chances each
afternoon through Monday. Drier weather returns mid next week.


&&

.DISCUSSION...High pressure weakens today as multiple upper lows
and trough digging into the northern Rockies interact with each
other. Cooler temperatures aloft will support instability over
the interior this afternoon. The main uncertainty is if there will
be enough moisture to support thunderstorm development, but CAMs
are showing a few showers developing over eastern Trinity and the
Yolla Bolly`s. Saturday, the trough over the Rockies continues to
dig westward while a secondary upper low approaches the southern
California coast. This pattern looks like it will bring slightly
more moisture which could support more shower and thunderstorm
development over the interior. The highest chances in northern
Lake, eastern Mendocino, and eastern Trinity. The chance for
wetting rain (>0.1") is around 20-40% over much of Trinity and
eastern Mendocino, with much lower probabilities elsewhere.
Additional chances for showers and isolated interior thunderstorms
are possible Sunday and Monday afternoons, depending on the
positioning of the low. All told, the chance for wetting rain over
a 72 hour period from Saturday morning to Tuesday morning is only
around 40% for much of Trinity, and 20% outside of Trinity
County. At the coast, any precipitation would likely be in the
form of drizzle or a stray light shower. Drier and warmer weather
is likely to return by mid next week as ridging redevelops. JB


&&

.AVIATION...VFR conditions have prevailed through Thursday
evening. In contrast to previous nights, however, a robust marine
layer is evident on satellite even before midnight. Models suggest
MVFR to IFR ceilings will likely (65% chance) at least briefly
form along the coast Friday morning, with the greatest chances
around Humboldt Bay. Chances are even greater (80% chance) Friday
night into Saturday of MVFR ceilings forming even before midnight
Friday night. Otherwise, modest north winds during the afternoon
will be the only notable feature during the day Friday. /JHW


&&

.MARINE...Northerly winds peaked Thursday evening with some gusts in
the southern waters recorded in excess of 25 kts. Steep short period
seas have built near 10 feet in response. Heading into Friday,
moderate to strong northerly winds will gradually shunt further
offshore. While some short period wave energy will linger closer to
shore, it to will push offshore by the evening with seas near shore
falling below 6 feet.

WInds will generally weaken this weekend. Winds will remain gentle
for the inner waters, but gusts up to 25 kts will ebb and flow
through the outer waters. Seas will be mostly controlled by short
period seas, though a mid period westerly swell up to 4 feet will
modify the sea state through the weekend. More widespread, calmer
conditions are expected for all waters early next week. /JHW


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 6 AM PDT early this morning for
     PZZ455.

     Small Craft Advisory until noon PDT today for PZZ470.

     Small Craft Advisory until 3 PM PDT this afternoon 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.

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