995
FXUS66 KSEW 131625
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
925 AM PDT Mon Oct 13 2025

.SYNOPSIS...Showers will taper across western Washington today as
a weather system exits to south of the area. Weak high pressure
building into the region, combined with offshore flow, and will
bring cool and dry conditions to the western Washington on Tuesday
and Wednesday. A weak system will bring the return of showers to
the area Thursday into Friday with a stronger, wetter system
expected to move into the area next weekend.

&&

.SHORT TERM /TODAY THROUGH WEDNESDAY/...Dry northerly flow today
with gusty NE Fraser River outflow winds in the north. Winds will
ease this afternoon. Precipitation has tapered off with just light
showers near the south Cascades crest. Highs around 60 today. 33

Previous discussion...Radar shows showers continuing to move
northwestward across the region early this morning as the upper
level low that has been over the region the past several days
gradually pushes to the south of the area. Expect shower activity
to become more confined to the Cascades through the morning hours
and to gradually taper throughout the day as the low slowly
continues to exit the region. With high pressure remaining
situated over British Columbia, gusty northeasterly Fraser Outflow
winds have developed across portions of Whatcom County and the
San Juan Islands and will continue through the morning hours. NE
winds of 20 to 30 mph, with gusts to 45 mph, will remain possible
through the morning, before winds start to ease this afternoon.

Cool and dry conditions are expected on Tuesday with offshore
flow persisting across western Washington and weak high pressure
building into the region. This drying trend, combined with
decreasing cloud cover, will make for rather cool nights across
the area and will bring the potential of frost to develop across
portions of the interior lowlands (especially in sheltered areas
away from water and areas near the Cascades) on Tuesday and
Wednesday mornings. Conditions will remain cool and dry into
Wednesday, though winds will transition back to onshore throughout
the day. Overnight lows both days will be in the mid to upper 30s
for areas across the interior and in the upper 30s to low 40s for
areas near the water, with afternoon highs generally trending in
the upper 50s to low 60s.

.LONG TERM /THURSDAY THROUGH SUNDAY/...Weak high pressure will
remain over the area into Thursday, though guidance continues to
hint at the potential for a weak front to make its way inland
Thursday night into Friday for the next round of precipitation
across western Washington. Afternoon highs will be in the upper
50s to low 60s and morning lows will warm some from Tuesday and
Wednesday- and look to generally trend in the upper 30s and 40s.
Typical fall-like weather looks return over the weekend, with a
stronger, wetter system favored to arrive Saturday into Sunday. 14

&&

.AVIATION...An upper-low will sink southward today as light and
variable flow aloft becomes more northeasterly in the afternoon and
into Tuesday. Offshore flow will persist in the lower-levels
throughout this time. Currently, mostly VFR cigs this morning with
isolated MVFR over the South Sound. Lingering low clouds/fog this
morning should burn off to VFR and mostly clear skies as drier flow
aloft takes hold. Fraser river outflow winds over W Whatcom with
winds gusting to 30 kt remains on tap but should peter out by the
evening. Skies trending clear Monday night though with lingering
surface moisture from recent showers, can`t rule out patchy fog and
low clouds developing into Tuesday morning.

KSEA...VFR ceilings throughout much of the TAF period. Skies will
trend clearer by Monday afternoon. Northeast wind 6 to 10 knots
increasing to 10 to 15 kt today. Can`t rule out gusts near 25-30 kt
in the afternoon before winds decrease in magnitude during the
evening. VFR again on Tuesday.

McMillian

&&

.MARINE...A low pressure system will continue to move southward
along the coast today, with northeasterly winds. Small Craft
Advisory strength winds will continue through most of the coastal
waters and Strait of Juan de Fuca before expiring in the afternoon-
early evening. Fraser Outflow winds has developed bringing frequent
gale gusts over the Northern Inland waters where a Gale Warning
continues. As mentioned, winds will gradually decrease by the
evening as the low pressure system shifts south towards California.
High pressure looks to build Tuesday and into Wednesday which will
bring light onshore flow through the area waters and calmer
conditions. The next impactful system looks to arrive by the end of
the week.

Combined seas 8 to 10 ft this morning and steep at times, decreasing
to 4 to 7 ft as the day progress. Seas remain around 4 to 6 feet on
Tuesday through midweek before potentially rising above 10 ft on
Friday.

McMillian

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Wind Advisory until 2 PM PDT this afternoon for Lowlands of
     Western Whatcom County-San Juan County.

     Winter Weather Advisory until 11 AM PDT this morning for
     Cascades of Pierce and Lewis Counties.

PZ...Small Craft Advisory until 2 PM PDT this afternoon for Central
     U.S. Waters Strait Of Juan De Fuca-East Entrance U.S.
     Waters Strait Of Juan De Fuca.

     Gale Warning until 2 PM PDT this afternoon for Northern Inland
     Waters Including The San Juan Islands.

     Small Craft Advisory until 5 PM PDT this afternoon 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.

&&

$$