359
FXUS66 KEKA 182227
AFDEKA

AREA FORECAST DISCUSSION
National Weather Service Eureka CA
327 PM PDT Tue Jun 18 2024

.SYNOPSIS...Dry weather is expected for the foreseeable future.
Interior temperatures begin a slow warming trend through the work
week with temperatures approaching 100 degrees in some interior
valley locations Friday into Saturday.


&&

.DISCUSSION...Dry weather conditions are expected persist through
the foreseeable future as dry air remains in place within the
mid- levels of the atmosphere over Northwest California. Visible
satellite imagery shows cirrus (high-level) clouds spreading from
northwest across the area this afternoon, while stratus near
coastal Humboldt finally scatter out. Temperatures has been
running 5 to 10 degrees warmer compared with yesterday`s reading
as a weak high pressure builds over the area, with inland highs in
the mid 70`s to mid 80`s. Tonight, stratus are expected to
redeveloped around Humboldt Bay and vicinity. Light offshore flow
is expected again tonight into Wednesday.

Smoke from the Sites Fire in Colusa Co. is forecast to spread
over Lake County overnight through Wednesday morning. HRRR smoke
dispersion model indicates more waves of smoke from Sites Fire
spreading form east-southeast on Thursday.

Troughing the next couple days will keep temperatures over the
interior near normal through Wednesday. By Thursday the trough
will begin to break down and 850 mb temperatures will warm across
the interior allowing some interior valleys to approach 100
degrees Friday into Saturday. This will bring a moderate heat risk
for portions eastern Mendocino, Trinity and Lake counties. All
while this is occurring, northerly winds and increasing low-level
moisture at the coast will result in increasing chances of coastal
stratus through the week with temperatures remaining near normal
at coastal sites.

Ensemble cluster analysis and deterministic models shows the high
pressure flatten on Sunday as a upper-level trough moves toward
the Pacific NW. An associated weak, dry cold front sweep east-
southeast across Northern California. Thus, temperatures will
moderate a few degrees across the interior late in the weekend
into early next week but still remain several degrees above
normal. /ZVS




&&

.AVIATION...Stratus has been stubborn early this afternoon, but
is slowly diminishing. All terminals this afternoon will be VFR,
with NNW winds peaking at 15 to 20 knots. Winds are expected to
diminishing by sunset. Tonight, stratus is expected to make a
return and be more widespread than today`s. Stratus is expected to
develop around Humboldt Bay and ACV, then advect north to CEC,
bringing MVFR to IFR conditions. Stratus looks likely to stay
offshore most the day Wednesday, but the coastal terminals could
still be affected periodically. UKI is expected to stay VFR
through Wednesday. JB


&&

.MARINE...Northerlies will continue to ease into Wednesday.
However, moderate to locally fresh northwesterlies persist over
the outer waters. Afternoon fresh to locally strong northerlies
are expected south of Cape Mendocino on Wednesday. Generally
light gentle breeze is expected nearshore, with a period of
southerlies north of Cape Mendocino tonight. Fresh breeze spread
across the outer waters and early Thursday as a thermal trough
develops inland, with locally strong winds downwind Cape
Mendocino. Steep short period seas will continue to promote
hazardous conditions for small craft primarily in the outer zones
for the rest of the week. /ZVS


&&

.EKA WATCHES/WARNINGS/ADVISORIES...
CA...
None.
NORTHWEST CALIFORNIA COASTAL WATERS...
     Small Craft Advisory until 3 PM PDT Wednesday for PZZ455.

     Small Craft Advisory until 3 AM PDT Friday for PZZ470-475.

&&

$$

Visit us at https://www.weather.gov/eureka

Follow us on Facebook and Twitter at:
https://www.facebook.com/NWSEureka
https://www.twitter.com/NWSEureka

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