947
FXUS66 KSEW 261527
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
827 AM PDT Sat Apr 26 2025

.SYNOPSIS...High pressure remains in place through the weekend,
with some cooling on Sunday. A weak frontal system will move into
the area early in the week for light precipitation, with ridging
rebounding in the second half of the week.

&&

.UPDATE...Stratus continues to work its way north into Puget Sound
this morning (coming in from a push on the south side of the
Olympics). This will likely put a damper to some of the high
temperatures expected for today (more mid 60s instead of temps
closer to 70). The cloud coverage will most likely clear out once
it warms up getting closer to the afternoon.

HPR

&&

.SHORT TERM /TODAY THROUGH MONDAY/...Some stratus has made it to
the southern coast early this morning, primarily impacting Grays
Harbor County. It is unlikely that much more stratus will get any
further east than Olympia throughout the rest of the morning.
Isolated pockets of lower clouds are possible in portions of Puget
Sound but will not be widespread if they develop. Onshore flow
will get a bit breezy at times by early this afternoon, primarily
in the southwest interior, along the coast and through the Strait
of Juan de Fuca. Gusts of 25 to 30 mph are possible through the
Strait and along the coast. Temperatures today will still be in
the mid to upper 60s across Puget Sound and low to mid 50s along
the coast.

A weak low traversing to the south by Sunday will cool things off
a bit into the low 60s and upper 50s and keep Washington under
split flow aloft. A more zonal flow pattern sets up on Monday and
opens the door for the next weak system to arrive Monday night
into Tuesday. QPF amounts are generally light, under a quarter of
an inch with the exception of the coast and north Cascades seeing
slightly above a quarter inch. This system has high snow levels,
keeping rain in the forecast for all Cascade passes.

.LONG TERM /TUESDAY THROUGH FRIDAY/...Rain is expected to taper
off by late Tuesday morning, with lingering showers in the
Cascades. A ridge returns by Wednesday, bringing back warmer
temperatures through Thursday where highs could reach the mid 70s.
Chances for rain return late next week, but some timing
discrepancies between the models right now limit what to expect
in terms of rainfall amounts.

21

&&

.AVIATION...Upper level low moving into Central California today
with weak trofiness over Western Washington. Upper level low
moving east tonight and Sunday with a weak upper level ridge
building into British Columbia coastline. Light flow aloft
becoming northwesterly tonight. In the lower levels onshore flow
through the weekend.

IFR stratus along the coast inland and inland over the central
interior. Stratus dissipating 17z-19z. VFR conditions with just
some high clouds for the remainder of the area. Stronger marine
push tonight with MVFR stratus getting into the Puget Sound area
08z-10z.

KSEA...IFR ceilings this morning through 19z otherwise just some
high clouds. Stratus reaching the terminal early Sunday morning
with MVFR ceilings. Southwest wind to 8 knots trying to becoming
northwesterly 21z-03z but most likely ending up in the 250-280
degree range. Southwest wind 6 to 10 knots after 03z tonight.
33/Felton

&&

.MARINE...Onshore flow pattern will continue through the weekend.
High pressure will build over the waters later Sunday, with a
weak weather system moving across the waters later Monday into
Tuesday. High pressure will rebuild Wednesday.

Small craft advisory westerly winds in the Central and Eastern
Strait tonight and again Sunday night.

Small craft advisory northwesterly winds continuing in the outer
coastal waters through tonight with small craft advisory seas
Sunday.

Small craft advisory seas in the inner coastal waters today, seas
9 or 10 feet with a 9 second period. Felton

&&

.HYDROLOGY...No river flooding is expected over the next 7 days.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 6 PM this evening to 6 AM PDT Sunday
     for Central U.S. Waters Strait Of Juan De Fuca-East
     Entrance U.S. Waters Strait Of Juan De Fuca.

     Small Craft Advisory from 6 PM Sunday to 6 AM PDT Monday for
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance
     U.S. Waters Strait Of Juan De Fuca.

     Small Craft Advisory until 6 PM PDT this evening for Coastal
     Waters From Cape Flattery To James Island Out 10 Nm-Coastal
     Waters From James Island To Point Grenville Out 10 Nm-
     Coastal Waters From Point Grenville To Cape Shoalwater Out
     10 Nm.

     Small Craft Advisory until 6 PM PDT Sunday for Coastal Waters
     From Cape Flattery To James Island 10 To 60 Nm-Coastal
     Waters From James Island To Point Grenville 10 To 60 Nm-
     Coastal Waters From Point Grenville To Cape Shoalwater 10
     To 60 Nm.

&&

$$