Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
569
FXUS66 KSEW 261014
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
314 AM PDT Sun Apr 26 2026
.SYNOPSIS...
Dry northerly flow aloft continuing today. Combination of a weak
system reaching the area and increasing low level flow producing
cloudier and cooler weather Monday into Tuesday. Upper level
ridge over Western Washington Wednesday and Thursday with weak
trofiness Friday and Saturday.
&&
.SHORT TERM /TODAY THROUGH TUESDAY/...
Satellite imagery shows area of fog and low clouds over Grays
Harbor county south of Highway 12 otherwise clear skies over
the region. Temperatures at 3 am/10z were in the mid 30s to mid
40s.
Sunny day today with dry northerly flow aloft. The fog and low
clouds in Grays Harbor county will dissipate early this morning.
Frost advisory remaining in effect for portions of the Central
and Southern Puget Sound until 10 am. Highs in the lower to mid
60s.
Surface high pressure building offshore tonight increasing the
low level onshore flow. Low clouds developing along the coast
tonight spreading inland to the Puget Sound area early Monday
morning. Lows in the upper 30s to mid 40s.
Weak upper level disturbance combined with the low level
onshore flow keeping skies mostly cloudy Monday. Chance of
drizzle/light showers along the coast with a chance of afternoon
showers over the mountains. Highs cooling into the mid 50s to
near 60.
Weak disturbance moving through Monday night with low level
onshore flow into Tuesday morning. Chance of light showers
continuing for the coast and mountains with mostly cloudy skies
elsewhere. Lows in the mid 40s.
Low level onshore flow becoming light Tuesday. Upper level ridge
offshore beginning to move towards Western Washington but not
close enough to provide good subsidence to break up the marine
layer. Under mostly cloudy skies highs remaining in the mid 50s
to near 60. Felton
&&
.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
Extended models in good agreement initially with the upper level
ridge moving over Western Washington Wednesday for more sunshine
and warmer temperatures. Highs in the 60s.
Ridge remaining over the area Wednesday night before shifting
east Thursday. Low level flow turning offshore Wednesday night
becoming light Thursday. Thursday the warmest day in the
forecast period with highs in the 60s and lower 70s.
Operational runs of the ECMWF and GFS bring a weak trough over
the area Friday into Saturday. Ensemble solutions not really
getting on board with the operational run solutions. There is
general agreement on cooler highs but the operational runs are
around 5 degrees cooler than the ensemble means. Will stay with
the mean solutions for now which cools highs mostly into the 60s
both days with increasing cloud cover Saturday. Confidence not
very high in the Friday and Saturday forecast.
&&
.AVIATION...An upper ridge will remain offshore as we start the
week, with troughing over the Intermountain West. This has resulted
in continued northerly flow aloft. Light to weak onshore flow into
Monday morning. Predominantly clear skies with VFR for the interior
sites through Sunday. There remains approximately a 35 to 55% chance
of LIFR/IFR cigs for KHQM generally between 10 to 18z today. Onshore
flow will then increase Sunday night into Monday for a more
widespread low stratus push inland. North winds light this morning
before increasing into the afternoon.
KSEA...Clear conditions expected today and tonight. North winds
mainly 5 kt and below this morning. NW winds increase again around
20-21z. A 25-35% chance of MVFR cigs are forecast to develop early
Monday morning.
41
&&
.MARINE...
High pressure will remain over the coastal waters, with lower
pressure inland. Onshore flow will persist into the new but of
varying intensity. Guidance is hinting at westerly pushes down the
Strait of Juan de Fuca Sunday evening and Monday evening, but the
probability of gusts reaching small craft advisory thresholds is low
at this time so the Central/Eastern Strait will be capped at 20 kt.
A possible system end of the week producing breezy winds across more
of the waters. Additionally, low clouds/fog Sunday morning along the
Pacific Coast may reduce visibilities at times to mariners with
another threat existing on Monday morning.
Seas this weekend hold around 4-6 ft, and increase to 6-8 ft Monday
through next week.
41
&&
.HYDROLOGY...
No river flooding the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory until 10 AM PDT this morning for City of
Seattle-Lowlands of Lewis and Southern Thurston Counties-
Lowlands of Pierce and Southern King Counties-Olympia and
Southern Puget Sound-Southern Hood Canal.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion