Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
465
FXUS66 KSEW 251501
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
801 AM PDT Sat Apr 25 2026
.SYNOPSIS...
Upper level ridge offshore extending into Northern British
Columbia combined with large upper level low centered over the
Canadian Prairies giving Western Washington northerly flow
aloft through the weekend. The low will move east Monday. Weak
system embedded in northwesterly flow aloft moving through
Monday night/early Tuesday. Upper level ridge over the area
Wednesday and Thursday.
&&
.SHORT TERM /TODAY THROUGH MONDAY/...
The latest forecast remains on track with no updates this
morning. Northerly flow aloft over Western Washington for the
weekend. High clouds at times embedded in the flow aloft moving
through the area. Not enough to prevent plenty of sunshine both
days. Highs in the lower to mid 60s today and 60s Sunday. Could
need another frost advisory portions of the Southwest Interior
and South Puget Sound Sunday morning with lows in the mid 30s.
For the remainder of the area lows near 40.
Flow aloft becoming northwesterly Monday with the large upper
level low to the east moving east and the upper level ridge
offshore retrograding a little. Weak shortwave embedded in the
flow aloft reaching the area late in the day to increase cloud
cover and create a chance of showers over the higher terrain.
Increasing low level onshore flow Sunday night plus increasing
clouds Monday cooling highs into the mid 50s to lower 60s. Lows
in the lower to mid 40s.
Felton
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
Weak shortwave moving through Monday night for a chance of
showers. Chance of showers continues in the higher terrain
Tuesday with the air mass slightly unstable. For the lowlands,
partly sunny skies. Highs mid 50s to lower 60s.
Upper level ridge moving over Western Washington Wednesday into
Thursday for more sunshine and warmer temperatures. Model
solutions very inconsistent Friday. A small number of ensemble
solutions have cooler temperatures with a chance of showers as a
trough moves through the area. A majority of the solutions keep
the weather dry with above normal temperatures. Will stay with
that idea for now but will not be surprised if the forecast for
Friday changes in the next couple of forecast packages. Highs
Wednesday through Friday in the 60s and lower 70s. Lows in the
upper 30s to mid 40s.
&&
.AVIATION...
North-northeast flow aloft throughout the period with a ridge
offshore and a trough to the east. VFR skies today with mid to
high level few-sct. Breezy northerly surface winds this
afternoon with gusts near 20 kt. VFR again tonight however,
increasing onshore flow will brings a chance of low ceilings
along the coast (KHQM).
KSEA...VFR expected through the TAF period. North winds 5-10 kt with
gusts near 20 kt this afternoon. Winds become lighter after 00z.
41/HPR
&&
.MARINE...
High pressure will remain offshore with lower pressure inland.
North flow will continue over the waters with this pattern, with
the winds offshore at times. Increasing onshore flow will bring
the potential for SCA winds for Central and Eastern Strait
Sunday evening. Elsewhere, winds largely remain light, with the
potential for a weak diurnal push through the strait again on
Monday. Seas will remain in the 4-8 ft range.
41
&&
.HYDROLOGY...
No river flooding is expected over the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory until 10 AM PDT this morning for 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