247
FXUS66 KEKA 081901
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1201 PM PDT Tue Sep 8 2026

.KEY MESSAGES...

* Above normal temperatures likely through Thursday, including
  along the coast.

* Locally elevated fire danger for the higher elevations today and
  Wednesday.


&&

.SYNOPSIS...Much warmer temperatures are likely today through
Thursday, with warm temperatures even at the coast. Breezy
offshore wind will bring locally elevated fire danger today and
Wednesday. Cooler temperatures return late this week into the
weekend.


&&

.DISCUSSION...Building high pressure today through Thursday will
bring much warmer than normal temperatures, both to the interior
and the coast. Today, temperatures are forecast to be in the high
80s to the mid 90s for most interior valleys, while the immediate
coast could break 70. Wednesday and Thursday, the ridge
strengthens, bringing near or slightly above triple digit
temperatures to most of the interior valleys. This includes
valleys close to the coast which may not have experienced
temperatures this high so far this year, including Garberville and
the Eel River valley. Interior valleys are likely to see overnight
lows also trend upwards into the 50s or low 60s. Temperatures this
low is providing enough cooling at night to lower the HeatRisk
which has also kept conditions below advisory criteria. Still, interior
areas will see widespread Moderate HeatRisk which corresponds to
a moderate risk for heat-releated illness to those without proper
cooling. Drink plenty of water and stay safe out there!

Coastal areas also continue to warm as offshore flow continues to
inhibit coastal stratus formation with 70s possible at the
immediate coast and 80s possible just a few miles inland on
Wednesday. Offshore flow weakens Wednesday night into Thursday,
which may support more coastal stratus to form or move onshore.
Currently, stratus is likely to clear again by the afternoon and
relatively light sea breezes will still support a pleasant day in
the mid to high 60s.

Subtropical moisture from the remnants of Hurricane Marie
arriving Wednesday will complicate the forecast somewhat.
Instability continues to be modeled near zero with a less than 5%
chance for MUCAPE over 100 J/kg. Still, cloud cover could bring
slightly lower high temperatures than currently expected
Wednesday, along with a few virga showers.

Troughing rebuilds late this week into the weekend, returning near
normal temperatures and coastal stratus by Friday. By this
weekend, much of the interior is forecast to be in the 70s and 80s
with the coast in the low 60s. A weak front may bring light rain
to Del Norte and northern Humboldt Counties on Saturday, but
confidence remains low. There is around a 50% chance for any
measurable rain for Del Norte and 20% for northern Humboldt.
Chances for a tenth of an inch are around 20% in Del Norte
County. /JB


&&

.AVIATION...(18Z TAFs)...Offshore flow largely kept coastal
stratus from forming early this morning and VFR conditions are
being observed at all terminals. Offshore flow continues tonight
and is likely to prevent widespread stratus formation again, but
some patchy ground fog around sunrise may bring periodic and brief
LIFR impacts. Any low clouds will lift and scatter shortly after
sunrise. /JB


&&

.MARINE...Northerly winds have eased and wind-driven seas have
started to subside. Breezy northerly winds return Thursday and
are likely to continue south of Cape Mendocino through the
weekend. Along with wind driven seas, a long period south swell
from Hurricane Marie at around 3 to 5 ft will persist through the
week. JB/JJW


&&

.FIRE WEATHER...Much warmer and drier conditions are expected as
high pressure rebuilds this week. High temperatures in the
interior valleys will climb in the high 90s to just over 100
through Thursday. Afternoon relative humidities will fall into
the teens or single digits in the eastern portions of the area.
Offshore flow developing overnight will result in poor overnight
recoveries for the higher elevations and winds may be locally
breezy. Elevated to locally critical fire weather conditions are
possible in the highest elevations of Del Norte, Trinity, and
Humboldt Counties tonight into Wednesday morning with these
breezy winds. Troughing late this week into the weekend will
return cooler temperatures and a deeper marine layer.


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 6 AM PDT Wednesday for PZZ470.

     Small Craft Advisory until 6 PM PDT this evening 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