372
FXUS66 KEKA 180727
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1227 AM PDT Sat Jul 18 2026

KEY MESSAGES...

* Warmer temperatures are expected this weekend bringing minor to
  moderate HeatRisk.

* Possible showers and thunderstorms across the interior next week.

&&

.SYNOPSIS...Above normal temperatures return to the interior this
weekend. Monsoonal moisture returns Sunday into early next week,
bringing chances of showers and thunderstorms early to mid next week.


&&

.DISCUSSION...An upper level low off the Pacific Northwest coast
continues to move northeast into British Columbia. High pressure
rebuilds over the area as the trough moves eastward. Above normal
interior temperatures return today as high pressure strengthens,
with most interior valleys seeing high temperatures in the 90s to
just over 100. Minor to locally moderate HeatRisk is expected.
Slight northerly flow at the surface could bring some smoke from
fires in southern Oregon to Trinity County, but southerly flow aloft
is likely to keep most out of the area.

Starting Sunday night into Monday, monsoonal moisture is anticipated
to make it`s way north and west into the area. While moisture aloft
will likely be plentiful, instability looks limited, at least
initially. A few showers may be possible with this first pulse of
moisture Monday morning, but dry low levels will prevent much of
this from reaching the ground. Midweek has the best chance to see
some thunderstorms with moisture from the remnants of what is
currently Tropical Storm Elida possibly moving into the area. This
will need to be monitored closely, as some long-range ensemble
members show these remnants close to shore. /JB


&&

.AVIATION...(6Z TAFs)...Stratus has returned over or very near the
coastal terminals. IFR ceilings are likely at the coastal
terminals, with visibility reductions possible near sunrise. Some
lifting and brief scattering is possible, but stratus is likely to
be slightly more persistent today than previous days. NBM only
shows around a 50% chance of skies clearing at both ACV and CEC.
Ceilings may lift to IFR to MVFR, however, by the afternoon.
Interior areas are likely to remain VFR for the next 24 hours. /JB


&&

.MARINE...Northerly winds remain elevated in the outer waters and in
the lee of Cape Mendocino. Winds gradually ease, especially
nearshore today and Sunday. By Monday afternoon, peak gusts of 10-20
kts are expected across all waters. Light to moderate winds are
expected for much of the week.

Seas remain characterized mainly by wind waves and small mid to long
period northwesterly and southerly swells. Steep seas will slowly
ease in the outer waters this weekend and be relatively mild by
Monday. A larger southerly swell, peaking at 4-5 ft from Tropical
Storm Elida arrives Monday and continues for much of the week. With
relatively light northerly winds, seas could be dominated by this
swell. This could create some larger breakers than usual on the
southern facing beaches, especially south of Cape Mendocino.

&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 9 AM PDT this morning for PZZ455.

     Small Craft Advisory until 3 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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For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.png