Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
648
FXUS66 KSEW 020316
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
816 PM PDT Sat Aug 1 2026
.SYNOPSIS...Onshore flow continues into Sunday. Upper troughing
will remain over Western Washington on Sunday, resulting in
continued cooler temperatures and localized rain chances. Upper
ridging builds offshore Monday with ridging over the Pacific
Northwest much of next week.
&&
.SHORT TERM /TONIGHT THROUGH MONDAY NIGHT/...No planned updates
tonight.
Previous discussion...The bulk of the moisture associated with
todays front has weakened and move into the Cascades this
afternoon. A convergence zone will continue into tonight across
Snohomish County and vicinity, resulting in light rain at times.
Upper troughing continues to move across the Pacific Northwest
on Sunday for cooler temperatures, and chance of POPs, mainly
from Snohomish County northwards and in the Cascades. Otherwise,
morning clouds will slowly clear for some areas into the
afternoon for sunshine. Temperatures will only peak in the mid
60s to mid 70s Sunday.
Upper ridging begins to build offshore Monday, allowing for
drier conditions to return to western Washington and the
beginning of a slow warming trend. Of note, winds will have a
more north to northeast component beginning Monday, which will
likely allow for some wildfire smoke from BC and WA fires to
filter into Western Washington. This continues to be monitored.
&&
.LONG TERM /TUESDAY THROUGH SATURDAY/...The upper ridge
will further build over Western Washington Tuesday into midweek,
resulting in temperatures warming into the 80s to low 90s for
portions of the area. Moderate HeatRisk returns Tuesday and
Wednesday, especially for interior areas away from the water. In
addition, continued north to east flow will allow for the threat
of wildfire smoke to filter into Western Washington during this
period.
Ensembles have trended more towards consistent ridging over the
Pacific Northwest much of next week. Although the ridge may
flatten a bit Thursday, continued warm and dry conditions are
expected through late week. JD
&&
.AVIATION...Southwesterly flow aloft will become westerly tonight as
an upper trough offshore moves onshore into southern British
Columbia. Mostly VFR conditions prevail except in and around
convergence zone activity that will linger into this evening.
Ceilings are expected to fall back to high end MVFR areawide
tonight into Sunday morning. VFR conditions will then return
across the region by midday Sunday. Gusty post-frontal west to
southwesterly surface winds will ease later this evening.
KSEA...VFR conditions are expected to lower to high end MVFR
thresholds early Sunday morning before lifting again by midday
Sunday. Surface winds S/SW 10-15 knots easing under 10 kt by
04-06z. Winds will veer to the N/NW after 21Z Sunday.
33/27
&&
.MARINE...Post-frontal onshore flow will lead to small craft
advisory winds in the central/east strait and central/south Puget
Sound into this evening. High pressure will rebuild over the coastal
waters Sunday and remain in place into early next week as thermally
induced low pressure expands northward across the interior for
quieter conditions across area waters.
27
&&
.FIRE WEATHER...Continued onshore flow on Sunday will result in
good RH recoveries and keep fire weather concerns at a minimum.
A warming trend will begin on Monday, with elevated fire weather
concerns returning Tuesday through the majority of next week due
to the prescience of upper level ridging. Minimum relative
humidity values begin to drop into the 20 percent range on
Monday for Cascade Valleys and south Puget Sound, with lower RH
values around 20 percent Tuesday and Wednesday in these areas.
Although a slight uptick in onshore flow may return Thursday
into late week, RH values will remain low, with continued dry
conditions.
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 10 PM PDT this evening for Central
U.S. Waters Strait Of Juan De Fuca-East Entrance U.S.
Waters Strait Of Juan De Fuca-Puget Sound and Hood Canal.
&&
$$
NWS SEW Office Area Forecast Discussion