Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
772
FXUS66 KSEW 090342
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
842 PM PDT Wed Jul 8 2026
.UPDATE...No changes made in this evening`s update. The marine
layer has long since scoured out - leaving mostly wispy mid to
high level clouds along with a nice sunset. For tonight, areas
of marine stratus and possible localized fog are slated to
develop. Min temps are forecast to range between the mid 40s to
mid 50s. The previous discussion remains below along with an
updated aviation section.
&&
.SYNOPSIS...
Onshore flow will persist through the week, keeping western
Washington cooler with mixes of clouds and sun, as well as
slight chances of showers over portions of the Olympics and
Cascades. High pressure will build under a ridge early next
week, with high temperatures climbing back into the low 80s for
portions of the interior.
&&
.SHORT TERM /TONIGHT THROUGH FRIDAY NIGHT/...
A pretty persistent onshore pattern continues across western
WA. A weak front/trough continues to move east of the region,
with cloud coverage holding on in the interior on satellite this
afternoon. The cloud coverage is dissipating on the coast/north
interior, with some cloud breaks delayed to late
afternoon/evening. Temperatures will stay cool with highs in the
60s to low to mid 70s, with lows in the 50s through much of the
short term as the onshore pattern continues. Thursday in this
period appears the best day to see sunshine in the afternoon, as
the onshore gradient weakens some. The overall pattern is dry,
but with some forced mountain ascent with limited (but
sufficient moisture), a couple showers in the Olympics and
Cascades can`t be ruled out this afternoon, and Friday.
&&
.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
Onshore pattern will continue Saturday with a trough beginning
to dip south into the Pacific, and moving onshore Sunday. Once
again, a few showers will be possible Saturday and Sunday for
portions of the mountains as a front drives through under the
trough. Cloud coverage largely holds on through late Sunday, as
the trough moves inland. Ensembles show a brief ridge building
in between troughs on Monday and Tuesday. There is some
disagreement as to how sharp (or broad) the trough offshore will
be (which may lead to some tweaks into the next week forecast as
the models get closer) but a brief warmup on Monday and Tuesday
appears likely. Highs these days will climb back into the low
80s across most of the central/south interior, but there is only
a 10-30% chance of Moderate (Orange) HeatRisk. Cooling off on
Wednesday remains a question as to how quickly the next trough
offshore moves inland.
HPR
&&
.AVIATION...
Low stratus has cleared most of the regional air
terminals this afternoon though some lingering scattered clouds
between 4-6kft AGL persist across the central Puget sound vicinity.
Otherwise...expecting return of coastal stratus late tonight and a
15-25% chance of some marginal MVFR ceilings reaching inland to
Seattle by daybreak. Anticipating more rapid clearing on Thursday
with VFR conditions for most TAF sites by late morning.
Breezy conditions early this evening near the coast and Strait of
Juan De Fuca will impact KCLM, KHQM, and KBFI through sunset before
diminishing with lighter winds expected Thursday.
KSEA...Improving sky conditions have developed near SEATAC this
afternoon though scattered clouds with bases between 4-6kft AGL
persist. An increase in cloud cover is expected tonight with a 15-
25% chance of marginal MVFR ceilings by daybreak. Overall however,
ceilings and overall sky conditions are expected to be better than
last night, with decreasing clouds and VFR conditions expected to
return by late morning Thursday.
Winds will be light through the period, favoring south and southwest
directions by early Thursday morning through Thursday afternoon.
&&
.MARINE...
Onshore flow will prevail through the remainder of the week and
weekend. Highest wind/waves will be found through the Strait of
Juan de Fuca during the afternoon and evening hours. Gales or
Small Craft Advisory westerly winds are expected through the
strait each day. 33/AH
&&
.FIRE WEATHER...
The current onshore pattern will continue through next weekend,
which will lead to continued periods of excellent moisture
recoveries (RH values) next few mornings. A ridge and high
pressure pattern appear likely to briefly build into the region
Monday and Tuesday next week. While the onshore pattern will
largely remain in place with light winds, warmer daytime
temperatures and clear skies will likely lead to RH values
dipping into the 30s and 20s, with the lowest values in the
south interior and Cascades. This will allow dry fine fuels to
continue to dry, and so piles of dead fuels, or dry grass/shrub
areas may become susceptible to fire starts Monday and Tuesday
with elevated fire weather conditions.
HPR
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Gale Warning until 5 AM PDT Thursday for Central U.S. Waters
Strait Of Juan De Fuca-East Entrance U.S. Waters Strait
Of Juan De Fuca.
&&
$$
NWS SEW Office Area Forecast Discussion