504
FXUS66 KEKA 190721
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
1221 AM PDT Sun Jul 19 2026

KEY MESSAGES...

* Warmer temperatures are expected today bringing minor to moderate
  HeatRisk

* Possible showers and thunderstorms across the interior tonight
  through Wednesday.


.SYNOPSIS...Above normal interior temperatures continue today.
Monsoonal and tropical moisture arrives tonight into early next
week, bringing chances of showers and thunderstorms early to mid
next week.


&&

.DISCUSSION...High pressure continues to build over the area,
bringing warm interior temperatures into the 90s to just over 100 to
most interior valleys. Minor to locally moderate HeatRisk is
expected with this heat. Hazy skies are possible from fires in
southern Oregon and northern California, but impacts are expected
to be minor.

Monsoonal moisture return again tonight into Monday. While moisture
aloft will be plentiful with PW of over 1 inch, instability is still
meager. Some CAMs do show CAPE of up to 200 J/kg which does bring a
low (5-15%) thunderstorm threat. Dry low levels will limit any
precipitation from reaching the ground, which will elevate fire
weather concerns. Moisture from Tropical Storm Elida begins to
stream in Monday which will continue the threat for a few showers
and possibly a thunderstorm. This trend will continue through
Wednesday with shower and thunderstorm chances generally increasing
each afternoon with Wednesday having the highest chances. Still,
chances are low at around 15% mainly in Trinity County. Uncertainty
remains high as the path of the remnants of Elida will strongly
influence what areas see impacts. Some ensemble members show the
center of the low very close to the shore of the North Coast.

Increased cloud cover and weaker high pressure will nudge interior
temperatures closer to average, though most interior valleys will
still see 90s. Most coastal areas will see highs in the 60s with
overnight and morning stratus. /JB


&&

.AVIATION...Stratus has returned to coast with IFR
ceilings being observed. IFR to LIFR ceilings are likely early this
morning with visibility impacts possible near sunrise. High pressure
strengthens the marine inversion, possibly bringing more persistent
stratus to the coast. NBM gives ACV a 60% of scattering and lifting
this afternoon, while CEC has a 40% chance. Interior areas are
likely to remain VFR for the next 24 hours. /JB


&&

.MARINE...Northerly winds continue to gradually ease and move
farther off the coast. Still, the outer waters could see peak gusts
of 20-30 kts today, with the strongest winds in the lee of Cape
Blanco. Winds continue to ease Monday with peak gusts of 15 kts or
below likely for all waters. Nearshore winds will be relatively
light, and could be southerly along the coast as eddies form. Winds
will generally be mild for much of the week.

Seas remain characterized mainly by decaying wind waves and small
mid to long period northwesterly and southerly swells. Steep seas
will slowly ease in the outer waters today 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 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 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