Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
233
FXUS66 KSEW 030940
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
240 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/...
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 will form around 10-12z at the terminal
and last before clearing to VFR around 19-20z. An additional round
of LIFR/IFR stratus again likely into early Sunday morning.
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