Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
895
FXUS66 KSEW 031535
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
835 AM PDT Sat Oct 3 2026
.SYNOPSIS...
High pressure building overhead and weak offshore flow will
maintain mild and dry conditions through the weekend. A system
to the north will flatten the ridge by the beginning of next
week, with near-zonal flow aloft and onshore flow at the
surface maintaining seasonable conditions with morning clouds
and afternoon sun breaks.
&&
.SHORT TERM /TODAY THROUGH MONDAY/...
Stratus and fog continue to linger over the interior lowlands of W
WA this morning while the coast has largely broken out with skies
clearing there. Remainder of CWA should follow suit by early this
afternoon. That said, inherited forecast remains on track an no need
for morning updates at this time. For additional forecast details,
please see Previous Discussion section below. 18
From Previous Discussion...As a weak frontal system continues to
progress east of the Cascades, high pressure will continue to build
over western Washington over the weekend. Weak offshore flow will
develop this morning, helping to burn off a shallow marine layer
expanding inland early this morning. Conditions across much of the
lowlands will become sunny by the afternoon, with highs reaching the
upper 60s to lower 70s. As high pressure aloft continues, offshore
flow will limit a marine push early Sunday morning, with additional
warming from a thermally induced surface trough bringing highs
Sunday afternoon into the 70s for most inland areas away from the
water. Areas along the Cascade foothills and valleys will inch
closer to 80 degrees, with some areas along the Rainier Paradise
corridor reaching the lower 80s.
The upper level ridge will flatten by Monday as a weather system
moves inland over British Columbia, with near-zonal flow
developing over the Pacific Northwest into early next week. This
will bring a return to onshore flow, which will bring a stronger
morning marine push of clouds inland and a return to more
seasonable temperatures in the 60s to lower 70s.
&&
.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
A flattened upper level ridge is favored to remain over the
region through much of next week, maintaining near-normal
temperatures and periods of morning clouds with afternoon sun
breaks. Most areas will see high temperatures in the mid 60s to
lower 70s, with a dry week on tap across western Washington.
Ensembles continue to hint at a possible pattern change with
wetter conditions developing by the end of next week, though
confidence remains low over the timing as deterministic models
continue to delay the onset of this potential next system. For
now, expect dry, cloudy, and seasonable conditions with fairly
little change day to day throughout next week.
15
&&
.AVIATION...
An upper-ridge is building across the region bringing west-
southwesterly flow aloft. High cloud coverage is streaming overhead
but not thick enough to discourage low clouds/fog development. As a
result, LIFR/IFR fog/low stratus will continue this morning before
conditions improve toward 19-20z to VFR as offshore flow increases.
An additional round of low clouds/fog is in store overnight Saturday
into Sunday morning.
KSEA...Surface wind will remain northerly through the period between
4-8 kt. IFR to LIFR stratus at the terminal with clearing to VFR
around 19-20z. An additional round of LIFR/IFR stratus again likely
into early Sunday morning.
33/41
&&
.MARINE...
Offshore flow is in store for this weekend as a thermal trough forms
along the coast. Winds will turn onshore again Sunday night into
Monday as low pressure shifts inland and surface high pressure
builds offshore. Onshore winds will be strongest through the Strait
of Juan de Fuca with Small Craft Advisory winds likely. Westerly
pushes are favored throughout the upcoming week.
41
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion