Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
804
FXUS66 KSEW 032113
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
213 PM PDT Fri Apr 3 2026
.SYNOPSIS...
Showers will taper off to the north this afternoon before an
upper level ridge brings 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/...
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 /SUNDAY NIGHT 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. With the
exception of MVFR ceilings along the north coast today and patchy
low clouds Saturday morning, primarily VFR is expected through the
forecast period.
KSEA...VFR. High and mid level clouds will thin with time and
scatter out overnight. Low clouds are not expected to be within the
vicinity of the terminal on Saturday morning. Surface winds
southerly 5 to 8 knots will veer northwesterly early this evening
then become light north/northeasterly overnight. Northerly winds
will increase to 8 to 12 knots Saturday afternoon and evening.
27
&&
.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 from 11 PM this evening to 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