004
FXUS66 KEKA 060821
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
121 AM PDT Thu Aug 6 2026

.KEY MESSAGES...
* Moderate to major heat risk continues through the weekend for
  much of the interior.

* Coastal stratus to continue for much of the North Coast.

* Increased winds and low relative humidity will elevate fire
  danger this weekend.


&&

.SYNOPSIS...Persistent high pressure aloft will remain through
the week. Inland areas are subject to abnormally hot temperatures of
through the weekend. Coastal areas will remain mostly overcast
with temperatures in the lower 60s near the water.

&&

.DISCUSSION...A steady ridge of high pressure continues to impact
the west this week leading to warm to VERY hot temperatures for the
inland areas. Most inland valleys can expect high temperatures
between 100-110degF through the work week. The coast continues to
offer some relief from this heat. Offshore stratus is blanketing
much of the western seaboard from the Mexican boarder up through
Oregon. Temperatures will struggle to reach 65degF for coastal
communities due to this compressed marine layer. However, above
average SSTs will limit the likelihood of any true daytime fog.

The weather pattern will have minimal changes through the week as
this high pressure is expected to remain overhead. A shortwave
moving by to the north will bring slightly cooler temperatures
today, although this will be shortlived. Some warming is expected
Friday and Saturday. A slight change in weather is possible this
weekend. Cluster and deterministic global model analysis shows
this high pressure ridge beginning to evolve into a more flatter
ridge through the weekend leading to potential zonal or even
slight upper level troughing entering next week. If this solution
materializes, it could lead to increased winds near the surface
with hot and dry conditions expected to continue Saturday. These
weather elements together can lead to increased critical fire
weather concerns. Until then however, expect warm interior
temperatures and foggy nighttime hours along the coast. Some
slightly cooler temperatures will start lower the heat risk Sunday
with some additional cooling next week. MKK/EYS

&&

.AVIATION...Model guidance is on the pessimistic side for the
overnight flight conditions. When taking the previous overnight
conditions into consideration along with similar set up,
persistence and caution are wise. LIFR conditions with ceilings
under 500ft are in place this morning at KCEC and KACV. With
offshore stratus encroaching on the coastline and already making
its way up the river valleys, Thursday morning will prove to be an
LIFR situation until the late morning/early afternoon Thursday.
Stable air mass and subsidence are helping sock the coastal
terminals in. KUKI will have prevailing VFR conditions as the
depth of moisture profile may not overcome orographic obstacles
into the valley. /EYS

&&

.MARINE...One more day of gentle to moderate breezes are expected
across the waters. There may a few areas of southerly winds
lingering near the coast this morning, but these will mainly turn
northerly this afternoon.

Friday and into the weekend, a more uniform regime of northerly
winds are forecasted to return to the area. Gales are possible
over the weekend into early next week with the likelihood of gusts
>30kts over 80% for most of the outer waters from Saturday
through most of next week. Conditions with these increased winds
will likely cause for marine hazards. Plan any seafaring
accordingly with this weather change happening Friday afternoon.

&&

.FIRE WEATHER...Conditions are expected to remain hot and dry
through Friday. This heat wave will likely cause an increase in
fire risk as the fuels dry. This weekend, the synoptic weather
pattern is likely to change ever so slightly. This change will be
felt by an increase in the likelihood of stronger valley winds
each afternoon. The primary areas of concern are in the eastern
Trinity River valley and on the eastern side of Clear Lake in Lake
County. Watch for updates as forecast confidence increases on
this potential weather change.


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
     Heat Advisory until 11 PM PDT this evening for CAZ105-106.

     Heat Advisory until 11 PM PDT Friday for CAZ108-116-117.

     Heat Advisory from 11 AM to 11 PM PDT Friday for CAZ110-111-
     113-114-118>120.

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