Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
544
FXUS66 KSEW 041719
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
1019 AM PDT Sat Apr 4 2026
.SYNOPSIS...
Upper level ridge building over the area today will remain in
place through the weekend. The ridge will drift east Monday.
Upper level trough moving by to the north Monday night and
Tuesday will induce a marine push. Dry northwesterly flow aloft
Wednesday through Friday with an upper level low well southwest
of Western Washington.
&&
.SHORT TERM /TODAY THROUGH MONDAY/...
Dry weather in the short term with an upper level ridge
building over the area today and tonight. Fog in the valleys of
the Southwest Interior and the Snoqualmie valley have mostly
dissipated and will continue to erode through the top of the
hour. The ridge will remain in place Sunday then slowly drift
east Monday. Upper level flow becoming southwesterly later
tonight into Monday. High clouds embedded in the flow aloft
moving through Sunday and Monday. Low level flow turning
offshore today. Offshore flow continuing through Sunday night
with the low level flow becoming light Monday. Warming trend
through Monday. Highs today in the mid 50s to lower 60s, Sunday
and Monday 60s to lower 70s. Lows in the 40s. Felton
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
Classic marine push scenario Monday night into Tuesday. Upper
level shortwave riding by to the north inducing an increase in
low level onshore flow. Much cooler Tuesday with highs in the
lower to mid 50s. Next upper level trough will go by well to the
north and east Wednesday. Dry northwesterly flow aloft
Wednesday through Friday with an upper low off the Northern
California coast remaining stationary. Highs recovering into the
mid 50s to lower 60s Wednesday through Friday. Lows in the 30s
through Thursday morning, mid 30s to lower 40s Friday morning.
Could see another round of frost advisories for the Southwest
Interior and Lower Chehalis Valley Wednesday and Thursday
morning.
&&
.AVIATION...
High pressure aloft remains over the region today. Expect northerly
surface winds to increase this afternoon across the region, easing a
bit overnight and increasing again Sunday. A few patches of fog
developed in the more prone locations (KOLM south through KCLS/KTDO
and west along the Chehalis River, as well as the Snoqualmie River
valley and around Whidbey Island). Passing high clouds at times
today and increasing into Sunday will yield little change. Expect to
see some patchy development of shallow fog again late tonight
through early Sunday morning, but elsewhere continued VFR conditions
under mostly clear skies.
KSEA...VFR is expected through period under mostly clear skies.
Northerly surface winds increase today to around 10-12 kt by 21z
through the day, easing only slightly overnight. North surface winds
continue Sunday. Any low clouds that form late tonight/early Sunday
will remain well away from the terminal area. Cullen
&&
.MARINE...
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.
21
&&
.HYDROLOGY...
No river flooding is expected in the next seven days.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion