Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
311
FXUS66 KSEW 030329
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
829 PM PDT Thu Apr 2 2026
.SYNOPSIS...
Showers will taper off today as high pressure builds into Western
Washington. This will kick off a warming and drying trend
through the weekend and into early next week. Chances of
precipitation increase towards the middle of next week as a
series of troughs pass over British Columbia.
&&
.SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/...
Only update this evening is the addition of a frost advisory for
the Chehalis Valley-Olympia area for tonight. Frost potential is
greatest for areas away from water. Otherwise the forecast
remains on track with convergence zone activity remaining in
southern Snohomish County this evening. -HPR
Lowland rain and mountain snow will continue to taper off throughout
tonight as a low pressure system progresses further inland.
Post-frontal convergence zone activity will linger between King
and Snohomish Counties into the evening, bringing potential for
locally heavy rain and breezy winds. Elsewhere, more benign
conditions will settle into the region today under cloudy skies
with some sun breaks and highs in the low 50s.
An upper level ridge will continue to amplify into the region into
Saturday, bringing in drier and warmer conditions. A weak system
moving over Vancouver Island on Friday may bring light rain showers
to the Olympic Peninsula and North Interior, but rainfall
accumulations are expected to be minimal. Highs will warm up to near-
normal on Friday with highs in the mid to upper 50s for most areas.
The warming trend will continue on Saturday, with highs reaching the
upper 50s to mid 60s for the lowlands.
&&
.LONG TERM /SUNDAY THROUGH THURSDAY/...
Sunday and Monday will bring the warmest conditions of the year so
far for most areas as high pressure remains overhead, with high
temperatures in the upper 60s to low 70s. The warmest temperatures
are favored across the south Sound and along the Cascade Foothills.
This also introduces Minor (Yellow) HeatRisk for areas south and
east of the Puget Sound on Sunday and Monday.
While deterministic forecast models maintain dry conditions through
much of next week, a series of troughs is set to move through
British Columbia towards the middle of next week, with chances for
light precipitation returning for western Washington.
&&
.AVIATION...
West to northwesterly flow aloft through Friday with
weak ridging building into the area. VFR conditions this evening
with widespread mid clouds. Weak convergence also continues in the
vicinity of Snohomish County with lingering showers along the
Olympic Peninsula. Cigs are expected to range between 025-060 for
the majority of tonight through Friday morning, with cigs lifting
and improving towards FEW/SCT from south to north Friday PM.
Southerly surface winds into Friday will transition more light north
during Friday evening.
KSEA...VFR cigs with continued mid clouds this evening. Cigs are
expected to range between 030-060 for the majority of tonight into
Friday. The probability of MVFR cigs peaks between 11 to 18z around
25%. Conditions will become more FEW/SCT by late Friday afternoon
through the evening. S/SW surface winds ranging between 5 to 10 kts
tonight into Friday. Winds may transition more N/NW Friday evening,
but are expected to remain light at this time under 5 kts. JD
&&
.MARINE...
Onshore low will gradually relax tonight as surface ridging over the
coastal and offshore waters shifts into the interior of Western
Washington. A weak front will clip the coastal waters on Friday, but
is not expected to generate much in the way of impacts. A ridge will
strengthen over area waters over the weekend with the flow turning
northerly or weakly offshore as thermally induced low pressure
expands northward along the Oregon coast. Onshore flow returns early
next week as another frontal system passes north of the waters. This
may generate a strong westerly push in the Strait of Juan de Fuca
Monday night into Tuesday.
Seas will straddle the 10 foot mark today before subsiding back into
single digits Friday into the early portion of next week.
27
.HYDROLOGY...
No river flooding is expected over the next 7 days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory until 9 AM PDT Friday for Foothills and Valleys
of Thurston and Lewis Counties-Lowlands of Lewis and
Southern Thurston Counties-Middle Chehalis River Valley-
Olympia and Southern Puget Sound-Willapa and Black Hills.
PZ...Small Craft Advisory until 2 AM PDT Friday for Coastal Waters
From Cape Flattery To James Island 10 To 60 Nm-Coastal
Waters From Cape Flattery To James Island Out 10 Nm-
Coastal Waters From James Island To Point Grenville 10 To
60 Nm-Coastal Waters From James Island To Point Grenville
Out 10 Nm-Coastal Waters From Point Grenville To Cape
Shoalwater 10 To 60 Nm-Coastal Waters From Point
Grenville To Cape Shoalwater Out 10 Nm-Grays Harbor Bar.
Small Craft Advisory until 10 PM PDT this evening for Central
U.S. Waters Strait Of Juan De Fuca-East Entrance U.S.
Waters Strait Of Juan De Fuca.
&&
$$
NWS SEW Office Area Forecast Discussion