Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
745
FXUS66 KSEW 272129
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
229 PM PDT Tue Oct 27 2026
.SYNOPSIS...
Troughing will persist over the Pacific Northwest
the remainder of today with unsettled conditions and periodic
showers. A frontal system will arrive tonight into Wednesday
for steadier rainfall and mountain snow. An upper low then
lingers over Western Washington into late week for showers and
cooler temperatures.
&&
.SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/...
Ongoing shower activity will continue throughout most of the
area this afternoon and evening, ahead of an approaching frontal
system. High temperatures this afternoon generally in the mid to
upper 50s across the interior, with low 50s for areas along the
water. Showers will turn into more steadier rainfall starting
tonight and continuing into Wednesday morning. Southwest winds
will also increase later this evening into Wednesday, peaking
between 20 to 30 mph generally in the areas of the Southwest
Interior through Shelton. As rainfall becomes steadier, we will
also see the first widespread mountain snow event of the season
unfold. A Winter Weather Advisory continues for all of the
Cascade zones, with snow levels 4000 to 4500 feet dropping to
3000 to 3500 feet by Wednesday morning. Snowfall accumulations
generally around 4 to 8 inches for Stevens Pass - with
Snoqualmie pass seeing around 1 to 3 inches. Areas in the
Southern Cascade Zone such as White Pass and Paradise will
likely see higher amounts, around 6 to 12 inches of snow. Those
traveling will want to be aware of the conditions and weather by
checking with WSDOT for updates.
Upper level troughing will continue Wednesday into Thursday for
spotty showers and cooler temperatures, with high temps ranging
in the low to mid 50s for most areas.
&&
.LONG TERM /FRIDAY THROUGH TUESDAY/...
Ensemble guidance continues to show troughing across the Pacific
Northwest through Friday, which keeps scattered showers in the
forecast. Snow levels hover around 2500 to 4000 feet on Friday,
so could continue to see light snow accumulations in the
Cascades. The upper level trough looks to slowly move out of the
area over the weekend, with a drying trend over the weekend into
early next week. High temperatures look to remain in the mid
50s over the weekend. with overnight lows approaching low to
mid 30s. Will continue to monitor the threat of frost or freeze
conditions.
Mazurkiewicz
&&
.AVIATION...
MVFR to VFR cigs have returned to area terminals this afternoon with
the exception of KPAE where there are convergent bands of rain
occurring. Additional showers are working their way inland from the
coast and will impact some of the Puget Sound terminals over the
next several hours. Winds will begin to increase out of the SSW
after 00Z, with gusts up to 25 kts expected. Light RA will return to
inland terminals after 05Z with another round of lower cigs expected
tomorrow morning. Probabilities of cigs less than 3000 ft are
around 60-80% tonight after 06Z and 45-55% tomorrow morning
between 15Z- 18Z.
KSEA...The most recent observations are indicating a return to VFR
cigs this afternoon and an uptick in the speed of the SSW winds.
Winds will continue to increase this afternoon with gusts of up to
20 kts, diminishing after 05Z. Rain will return late tonight
and become more scattered after 09Z. Vicinity showers will
persist through the end of the TAF period with MVFR cigs
expected until tomorrow afternoon.
21
&&
.MARINE...
Northwesterly winds along the outer coastal waters will linger into
Wednesday, with wind gusts approaching 25 kt at times and a SCA
still in effect until late tonight. Seas will be between 8-9 feet
overnight. Another frontal system will move into the waters tonight
into Wednesday, increasing winds and seas across the area.
Increasing onshore flow will bring a brief push of small craft
westerly winds to the central and eastern Strait late this afternoon
into this evening. Southerly winds are picking up along the Puget
Sound waters this afternoon, with latest guidance highlighting a 60-
80% chance of gusts exceeding small craft criteria particularly in
the waters from Seattle south.
Winds will ease again across the area waters on Wednesday as the
accompanying surface low drops into the area and tracks southward
along the coastal waters. This low will allow for flow to turn back
offshore, with offshore flow persisting the second part of the week.
Sea conditions slowly subsiding back to 4-6 ft on Thursday and
remain that way into the weekend.
21
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Winter Weather Advisory from 5 PM this afternoon to 5 PM PDT
Wednesday for Cascades of Pierce and Lewis Counties-
Cascades of Snohomish and Northern King Counties-Cascades
of Southern King County-Cascades of Whatcom and Skagit
Counties.
PZ...Small Craft Advisory from 5 PM this afternoon to 11 PM PDT
this evening for Central U.S. Waters Strait Of Juan De
Fuca-East Entrance U.S. Waters Strait Of Juan De Fuca-
Puget Sound and Hood Canal.
Small Craft Advisory until 5 AM PDT Wednesday 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.
&&
$$
NWS SEW Office Area Forecast Discussion