978
FXUS66 KEKA 232308
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
408 PM PDT Sun Aug 23 2026

.KEY MESSAGES...

- Warmer drier conditions for the interior Monday and Tuesday with
  gusty winds near the Trinity horn will elevate fire weather
  conditions.

&&

.SYNOPSIS...Dry, seasonable weather is likely for the early part
of the week. Slightly warmer interior temperatures are expected
Monday and Tuesday before another trough brings cooler temperatures
mid-week. Coastal stratus is likely to clear out again Monday
afternoon but may be more persistent later in the week.


&&

.DISCUSSION...Weak high pressure fills in over the area today
bringing slightly warmer temperatures this afternoon for the
interior. Most interior areas will see highs in the 90s with a stray
triple digit possible for the warmest valleys. The previously deep
marine layer is now shallower as high pressure fills in but will
continue to bring stratus to the river valleys near coast. Expect
clearing out again Monday afternoon as breezy coastal winds are
likely to scatter any remaining stratus bringing mostly clear, yet
breezy conditions to the coast. Temperatures will increase for
the next few days as weak ridging sets in, with southerly winds
oddly enough swooping into the area late tonight into early Monday
morning. These southerlies will find their way into channeled
terrain and into the central valley, focusing and funneling up the
interior which will bring fire weather concerns as air parcels
are pulled downslope into valleys near the Oregon border. (see
fire weather below)

Through the middle of the week, a trough starts to approach the area
bringing slightly cooler interior temperatures along with a deeper
marine layer. Light winds offshore may lead to coastal stratus to be
persistent into the afternoons. Moisture and instability is limited
with this troughing pattern, which will limit thunderstorm
potential. Generally mild, seasonable weather is likely towards the
end of the week. /EYS


&&

.AVIATION...Gusty winds at KCEC will ease to southerly by the
early Monday morning hours overnight. Southerly winds also fill
in overnight at KACV around the same time as KCEC, 04-07z. With
this southerly surge there will be a reduction in flight
categories as stratus and the marine layer make their way on shore
and into the coastal flight terminals. A much stronger signal for
LIFR and reduced visibility are being shown by MOS guidance with
NBM also putting a probability to 1/2sm visibility around 35% at
the coastal terminals. With the southerly wind pattern KUKI flight
categories become a concern as stratus usually pushes up the
adjacent river valleys. The lack of depth of the marine layer and
calm winds at KUKI may hamper this development. NBM probs only
have a < 10% chance of ceilings below 3000ft near KUKI overnight.
/EYS


&&

.MARINE...Northerly winds continue to increase across the outer
waters, in the lee of Cape Mendocino. Localized gale force gusts
are possible downstream from Cape Mendocino. Steep seas are likely
to propagate into the inner waters even as winds remain light.
Winds diminish Monday as a frontal boundary arrives.


&&

.FIRE WEATHER...A  warmer drier trend for the next 36 hours for areas
of the interior, particularly Trinity county bordering Siskiyou. Gusty
diurnal southerly winds coming up the north valley will be channeled into
mountainous terrain, possibly warming air parcels as they descend into
river valleys of Siskiyou. Exposed ridges will also be of concern.
Otherwise, recoveries will be moderate to good in the lower elevations
and poor in the higher elevations. Winds generally remain light and
terrain driven for our CWA with typical afternoon breezes. A deeper
marine layer returns mid week.



&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 9 AM PDT Monday for PZZ450.

     Small Craft Advisory until 9 AM PDT Monday for PZZ455.

     Small Craft Advisory until 6 PM PDT Monday for PZZ470-475.

&&

$$

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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https://www.weather.gov/images/eka/zonemap.png