Potter Valley, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

996
FXUS66 KEKA 080718
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1218 AM PDT Sun Jun 8 2025

.SYNOPSIS...Warmer temperatures inland this weekend. A slight chance
of thunderstorms over the Klamath Mountains and the Yolla Bollas on
Sunday, Monday, and Tuesday afternoons. Windy afternoons return to
NW California by the middle of next week.


&&

.DISCUSSION...A strong marine layer continues to impact coastal areas
of the CWA beneath a broad ridge over the PNW. Areas of dense fog
are once again possible along Highway 101 from coastal Del Norte
through Humboldt Bay/Eel River Valley, as well as coastal Mendocino
through Sunday morning. Another warm day expected Sunday, with NBM
and short-range models showing widespread interior temperatures in
the upper 80`s and low to mid 90`s. Heat-prone valleys will have a
greater chance of exceeding 100 degrees in the afternoon (NBM
probabilities 60 to 80%), especially in areas of interior Trinity,
Humboldt and Mendocino counties including Hayfork, Hoopa, Covelo,
Weaverville and Willow Creek (Big Bar RAW reached 105 degrees
Saturday afternoon). Those looking to cool off should exercise
extreme caution if spending time in and around rivers, as waters are
still cold and very dangerous. Minor HeatRisk could also impact
those sensitive to heat-related illnesses.

Forecast is still on track for potential convective activity as a
semi-closed low aloft (700-500mb) brings an increase in mid level
humidity and E-SE flow Sunday and Monday. SPC has consistently
included the interior CWA in isolated thunderstorm potential through
Monday evening. GFS and NAM highlight substantial moisture being
ushered into Northern California - model soundings still show a very
dry surface airmass beneath 5-10K feet, but above average CAPE
encouraging elevated convection. Hi-res CAMs show some scenarios
with convective cells developing in NE Trinity, but may stay
confined further east in the central valley - NBM still reading
about 10 to 20% chance for thunder in far eastern Humboldt, Del
Norte and most of Trinity. Either way towering cumulus will likely
begin to pop up across interior mountains in the afternoon.

Monday has a slightly increased chance in Trinity county for thunder
with NBM probabilities 20 to 25%. Mid-level moisture availability
and consistently warm temperatures contribute to potential
instability. Potential for gusty winds and dry lightning could be a
fire weather concern for these areas.

Chances for storms decrease on Tuesday with less available mid level
moisture - convective development looks to stay much further east of
CWA in southern OR and NE CA, potentially reaching the Trinity horn.
Brief ridging on Tue may be followed by a deeper trough Wed and Thu
next week. This trough looks quite dry and main impacts appear to be
a return of stronger gusty winds and cooler temperatures.


&&

.AVIATION...Confidence for LIFR stratus at coastal terminals is
high, with a 100% chance of ceilings less than 500 ft at KCEC and
80% chance of the same at KACV overnight and early Sunday morning.
However at KUKI there is a near 0% chance of LIFR stratus, largely
from the chance of wind direction back to the north along with a
shallow marine layer. Chances of visibility less than a mile of at
least 50% exist for both coastal sites as well, with NBM
deterministic forecasts at 1/4 SM at both sites for overnight and
early Sunday morning. Stratus will be quite stubborn along the coast
for Sunday. The potential of ceilings below 1000 ft at KCEC does not
drop below 60% for Sunday afternoon and doesn`t drop below 50% for
KACV. Potential for at least a short return to VFR visibility Sunday
afternoon is 60% for KCEC and 80% at KACV. Confidence is high that
KUKI remains VFR, with median northwest gusts at 14 KTS for Sunday
afternoon. /MH


&&

.MARINE...For overnight into Sunday, north light winds and lower
seas are forecast to keep impacts low, though stratus will create
foggy conditions in the overnight into Sunday morning. Northerly
winds gradually pick up again next week, with north winds forecast
20-25 kts by Tuesday. The potential for gales (40-60% chance)
arrives by Wednesday and Thursday. Combined wave forecast matches up
with NBM 90th percentile forecast fairly well as combined heights of
10 feet introduced into the northern waters by 06Z Tuesday and
becoming more predominant among all waters by Wednesday night into
Thursday. /MH



&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
None.
&&

$$

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