Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
014
FXUS66 KSEW 040321
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
821 PM PDT Fri Apr 3 2026
.SYNOPSIS...An upper level ridge will bring warming and drying
through the weekend. A weak system will cool things back down on
Tuesday, with drier conditions and near normal temperatures
through the rest of next week.
&&
.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...The current
forecast remains on track with no planned updates tonight. 33
Previous discussion...A weak shortwave moving over British
Columbia will maintain light rain showers along the North Coast
and Northern Interior through the afternoon today as high
pressure builds northward into the region. Conditions across
western Washington will dry out by this evening, with a warming
and drying trend through the weekend as an upper level ridge
continues to amplify. Clearing skies south of the Puget Sound
may allow for cooler temperatures overnight tonight and the
development of frost for cooler areas, and a Frost Advisory has
been issued for Saturday morning. By Saturday afternoon, skies
will become mostly sunny as low level flow turns offshore. An
upper level low will begin to drop along the Canadian Coast on
Sunday, introducing some high clouds across western Washington.
Temperatures will be the warmest of the year so far over the
weekend, with highs reaching the mid 60s across much of the
lowlands on Saturday, and temperatures increasing a few degrees
into Sunday. Conditions will be warmest in the Cascade valleys
and along the Cascade Foothills, along with the south Sound,
where temperatures are favored to surpass 70 degrees. This
introduces Minor (Yellow) HeatRisk for areas along and southward
of the Puget Sound on Sunday.
&&
.LONG TERM /MONDAY THROUGH FRIDAY/...Warm conditions will
continue on Monday as the upper level ridge breaks down and
shifts eastward. Highs will peak once again in the upper 60s for
most areas, with Minor HeatRisk once again for areas
surrounding the Puget Sound and southward.
Onshore flow will resume Monday night into Tuesday as a trough
pushes into British Columbia, with a marine push favored to
bring low stratus and patchy fog inland Tuesday morning.
Temperatures will cool off considerably with this trough,
bringing highs back down into the low 50s. The same upper level
trough will swing another front across western Washington on
Wednesday, but conditions look to stay mostly dry with this
frontal passage. Dry northwest flow is favored to continue into
Friday, with temperatures returning to near-normal.
15
&&
.AVIATION...Westerly flow aloft will continue into Saturday as
upper ridging centered south of the region builds northward.
High and mid level moisture associated with a dissipating
frontal system will thin with time as subsidence with the upper
ridge takes over. VFR will continue this evening across all
terminals with mid and high clouds in spots. There is low
confidence for lows clouds forming in the morning in some spots
(would most likely be MVFR if they do form) but otherwise
conditions will remain VFR through the TAF period. Winds will
shift to the north this evening across the terminals, remaining
5 kt or less tonight, and increasing to 5-10 kt Saturday.
KSEA...VFR is expected through the TAF period. High and mid level
clouds will thin with time and scatter out overnight. Probability
for MVFR clouds Saturday morning remain low. Winds flipping to the
west northwest this evening around 5 kt. Northerly winds will
increase to 8 to 12 knots Saturday afternoon and evening.
27/HPR
&&
.MARINE...High pressure will build over the area waters today
as a weak frontal system passes to the north and clips the
northern coastal waters. High pressure will remain over the
waters this weekend while a thermally induced trough expands
northward along the Oregon coast. This will shift the flow
northerly or weakly offshore. Onshore flow resumes early next
week as a frontal system passes to the north. A strong westerly
push is possible along the central and eastern Strait of Juan de
Fuca Monday night into Tuesday.
Seas across the coastal waters will build towards 7-10 ft
Tuesday into Wednesday.
27
&&
.HYDROLOGY...No river flooding is expected over the next 7
days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory until 9 AM PDT Saturday for Foothills and
Valleys of Thurston and Lewis Counties-Lower Chehalis
River Valley-Lowlands of Lewis and Southern Thurston
Counties-Middle Chehalis River Valley-Olympia and
Southern Puget Sound-Willapa and Black Hills.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion