829
FXUS66 KEKA 201150
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
450 AM PDT Thu Jun 20 2024

.SYNOPSIS...Dry weather is expected for the foreseeable future.
Interior temperatures will warm up toward the end of week with
temperatures exceeding 100 degrees in some interior valley
locations Friday and Saturday. Temperatures will then slowly
moderate Sunday and into next week.


&&

.DISCUSSION...Shortwave troughing greatly deepened the marine layer
this morning, and is currently over 2500 ft per the McKinleyville
profiler. As a result, stratus is protruding well inland and there
has been persistent light drizzle. The depth of the marine layer
and a strengthening inversion may hold in the low clouds today.
Remaining consistent with the ongoing pattern, 500 mb heights will
then begin to rise again in advance of the next trough. Before
the troughing returns, inland temperatures will rise through
Saturday.

Heat risk is forecast to increase to moderate levels by
Friday and persist in Saturday when high temperatures are forecast
to peak with inland valley highs to exceed 100. The ridge will then
begin to weaken on Sunday as a NE Pacific trough slides to the north
and temperatures slowly trend down into next week. Smoke from the
Sites Fire in Colusa County will continue to affect air quality in
the surrounding counties, mainly Lake. HRRR smoke guidance expands
the smoke farther west into Trinity and Mendocino counties today
from steering winds aloft. /JJW


&&

.AVIATION...A deepening marine layer persists along the coast
this morning along the coast. An upper level low is leading to
variable ceiling heights around 1000ft or so with momentary spots of
mist and drizzle bringing down visibilities. IFR conditions are
forecast to last through the day along the coast due to this stubborn
layer of stratus. Coastal terminals have possible chances of turning
overcast skies into broken layers, yet confidence of this occurrence
is low at the moment and is not referenced in the most recent TAF
issuance. Inland, calm mornings winds will evolve into afternoon
winds while some wildfire smoke will cover some of the area in the
supper levels.


&&

.MARINE...Northerlies are forecasted to remain breezy today, but
will remain in small craft criteria for the northern and souther
outer waters. Conditions warranting small craft conditions are
forecast to be in the inner waters, yet coverage will remain sparse,
thus no official advisory will be published. Winds will peak in the
afternoon with the highest winds (still below gale conditions)
occurring in the lee of Cape Mendocino. Gale force winds have high
probabilities to return to the outer northern and all the southern
waters (100% of >40mph gusts) Friday afternoon. More confidence on
coverage will be available as higher resolution model guidance
becomes available. Seas will remain steep through the week due to the
winds, especially in the outer waters. A pair of two foot, long
period westerly and southwesterly swells (respectively) will
continue diminish as the weekend approaches, leaving the sea state
to be driven by local wind waves.


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 3 AM PDT Friday for PZZ470-475.

&&

$$

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For forecast zone information
see the forecast zone map online:
https://www.weather.gov/images/eka/zonemap.png