Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
357
FXUS66 KSEW 241737
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
1037 AM PDT Wed Jun 24 2026
.SYNOPSIS...
Upper level ridge and thermally induced surface trough east of
the Cascades this morning. Light low level onshore flow today
will increase tonight. Clouds out ahead of the first system in a
couple of weeks spreading over the area Thursday. System moving
through Friday with a cool upper level low dropping down over
Western Washington Friday night and Saturday. Unsettled weather
continuing into the first part of next week.
&&
.SHORT TERM /TODAY THROUGH FRIDAY/...
Satellite imagery shows high clouds over portions of the area
this morning with low stratus right along the coastline near
Grays Harbor. Temperatures at 3 am/10z were in the mid 50s to
lower 60s except in the Seattle metro area where temperatures
were in the upper 60s.
Upper level ridge axis moved into Eastern Washington last night.
West southwesterly flow aloft with high clouds at times moving
through the area. Thermally induced surface trough east of the
Cascades as well. Light onshore surface gradients across Western
Washington early this morning will slowly increase during the
day. With the cooling aloft and weak marine push in the lower
levels high temperatures around 5 degrees cooler than Tuesday
over the interior, in the mid 70s to mid 80s. More cooling on
the coast with stronger onshore flow. Highs there in the mid
60s. Air mass becoming somewhat unstable this afternoon. Could
see some picturesque build ups over the Cascades by late
afternoon. Any shower activity associated with the build ups
will be east of the crest.
Low level onshore flow increasing tonight with gale force winds
in the Central and Eastern Strait of Juan de Fuca and breezy
southwesterly wind in the south Puget Sound and Hood Canal.
Stratus developing along the coast spreading inland early
Thursday morning with the marine layer getting east of Puget
Sound around sunrise. Lows in the 50s.
Onshore flow continuing Thursday with the marine layer
retreating back to the coast in the afternoon. High clouds
ahead of the next weather system spreading over the area in the
afternoon making for a cloudy to mostly cloudy day. Rain out
ahead of the front could reach the coast by mid afternoon.
Highs only in the 60s.
Rain ahead of the approaching frontal system spreading over all
of Western Washington Thursday evening with rain continuing
through the early morning hours. Lows in the 50s.
Front reaching the coast Friday morning moving through the
interior midday/early afternoon and into Eastern Washington by
late afternoon. Rain changing to showers behind the front. Post
frontal air mass unstable with a 20-30 percent chance of
thunderstorms. Convergence zone forming over Snohomish county in
the afternoon. Not much change in temperatures during the day
with highs in the mid 50s to lower 60s. The record low maximum
temperature for Seattle is 62 degrees. The forecast high is 63.
Felton
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
Cool upper level low dropping out of the Gulf of Alaska arriving late
Friday night and Saturday morning. Convergence zone could move
south over the Seattle area Friday night. Upper level low will
keep showers in the forecast through Saturday. High temperatures
will be similar to Friday, in the mid 50s to mid 60s. Lows
Friday night in the mid 40s to lower 50s.
Upper level low moving east of the area Saturday night with wrap
around moisture keeping a chance of showers in the forecast.
Lows again in the mid 40s to lower 50s.
North northwesterly flow aloft Sunday with an upper level ridge
building well offshore and the upper level low east of the
area. A couple of weak troughs embedded in the flow aloft moving
through the first part of next week. Will have to leave a chance
of showers in the forecast for these features. Highs will remain
below normal, in the 60s with lows in the mid 40s to lower 50s.
Seattle currently sitting at the 4th warmest June on record
through the 23rd. The cool weather to end the month will drop
June 2026 down the list. Even with the cooler last few days
Seattle still looking at ending up somewhere between the 7th and
10th warmest June on record. Felton
&&
.AVIATION...
VFR conditions this morning with scattered mid to high clouds
present. Stratus along the coast has receded and so VFR
conditions will persist today regionwide. A stronger push of
marine air will occur Wednesday evening, with models showing
MVFR/IFR stratus returning to the coastal terminals around 04Z,
progressing to the interior terminals after 12Z. Along the
coast, winds are westerly 7-12 knots with light and variable
winds across the interior. Winds will become more westerly and
increase to 8-15 knots across western Washington Wednesday
afternoon, and northwest briefly from BFI northward to the
Strait of Juan de Fuca from 00-05Z.
KSEA...VFR expected through tonight, with a 30-50% chance of
MVFR ceilings making their way into the terminal between 12-18Z.
A return of broader onshore flow on Wednesday will shift winds
to the west-southwest between 12-16Z with speeds increasing to
6-9 kts after 18Z. Models do not have the winds turning to the
north at the terminal this evening at this time, but will likely
switch briefly from 00-05Z areas to the north of the terminal.
Thaler/HPR
&&
.MARINE...
Thermally induced surface trough east of the Cascades. Low
level onshore flow increasing this afternoon and evening. Gale
force winds in the Central and Eastern portion of the Strait of
Juan de Fuca tonight with small craft northwesterlies in
Admiralty Inlet. Onshore gradients easing Thursday. Frontal
system moving through the waters Friday with possible small
craft advisory winds with and just behind the front. Winds
easing over the weekend.
Choppy seas over the outer coastal waters through tonight with
7 to 9 foot swells with a 7 to 9 second period. The choppy seas
will come to an end late tonight. Felton
&&
.FIRE WEATHER...
One more day of elevated fire weather concerns. Even though the
low level flow has turned onshore minimum relative humidities
will still drop to near 30 percent this afternoon. Increasing
low level onshore flow tonight with the marine layer making it
all the way to the Cascade foothills Thursday morning.
Wetting rains along the coast Thursday night and Friday with a
chance of wetting rains inland. Cool and unsettled weather over
the weekend continuing into the first part of next week. Felton
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Heat Advisory until 11 PM PDT this evening for City of Seattle-
Downtown Everett / Marysville Area-Eastern Kitsap County-
Eastside-Foothills and Valleys of Central King County-
Foothills and Valleys of Pierce and Southern King
Counties-Foothills and Valleys of Snohomish and Northern
King Counties-Lowlands of Pierce and Southern King
Counties-Shoreline / Lynnwood / South Everett Area.
PZ...Gale Warning from 6 PM this evening to 6 AM PDT Thursday 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 this evening to 2 AM PDT
Thursday for Admiralty Inlet.
Small Craft Advisory until 6 AM PDT Thursday 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