Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
379
FXUS66 KSEW 080337
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
837 PM PDT Fri Aug 7 2026
.SYNOPSIS...
Warm conditions today will be followed by a gradual cooldown
over the weekend to near-normal temperatures. The backside of
an upper level ridge will remain over Western Washington through
Saturday. Upper level flow becomes zonal on Sunday, continuing
through at least the first part of the week. Uncertainty in the
forecast increases towards the second part of the week.
&&
.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...
The backside of the upper level ridge that moved over the area
this week will begin to gradually flatten tonight. Although the
ridge flattens, heights will remain slightly elevated over the
area remain over the area and will start to gradually decrease
later on Saturday. This will lead to a gradual cooldown for
Western Washington this weekend with temperatures expected to
moderate to near-normal this weekend.
Stronger onshore flow will have the marine layer push further
inland Saturday morning. Expect cloudy skies in the morning and
then mostly clear skies in the afternoon. High temperatures on
Saturday will be in the upper 60s/low 70s for the coast and mid
70s/low 80s for the interior. Slightly cooler Sunday with high
temperatures in the 60s along the coast and mid to upper 70s in
the interior. Low temperatures will be in the 50s.
Wildfire smoke conditions have improved toward the coast and
will continue to improve across the interior and mountains this
evening. Some elevated smoke may not completely clear out until
early Saturday morning.
29
&&
.LONG TERM /MONDAY THROUGH FRIDAY/...
Zonal flow is favored to continue through at least the first part of
the week with temperatures near-normal. Past the middle of the week,
long-term guidance continues to struggle with the upper level
pattern. Solutions are split whether zonal flow will linger
into Wednesday or if a ridge or weak trough will take its place.
As for the second part of the week, solutions are evenly split
on whether the area will be under the influence of a ridge or
trough.
29
&&
.AVIATION...
A upper level ridge remains over the region today with west to
southwest flow aloft. Strengthening onshore low-level flow will
bring a stronger push of marine stratus into the interior
tonight. Expect this to return to the coast and western Strait
of Juan de Fuca this evening, and a brief period of IFR
stratus is expected at the Puget Sound terminals around sunrise
Saturday. Expect VFR conditions in the interior as stratus
clears around 17z Saturday, with clouds persisting along the
coast into the afternoon.
KSEA...VFR conditions continue this evening. Increasing onshore
flow likely brings IFR stratus into the terminal 13Z-17Z on
Saturday. Surface winds light from the west this evening,
becoming southerly tonight. VFR conditions return under clearing
skies Saturday afternoon with northwest winds 6-8 kt returning.
&&
.MARINE...
Broad surface ridging will remain centered over the offshore waters
with lower pressure east of the Cascades into early next week
maintaining onshore flow. This will lead to daily diurnally driven
small craft advisory strength westerlies in the central/east strait.
A series of weak systems passing north of the area early next week
will strengthen onshore flow for a low end risk of gales in the
central/east strait.
27
&&
.FIRE WEATHER...
Elevated fire weather conditions across the Cascades this afternoon
with above average temperatures in concert with dry conditions.
Minimum RHs have fallen into the mid 10s to lower 20s in some areas
of Cascade zones 658/659. While no significant wind or instability
is expected in the near term, and thus no need for any fire weather
headlines, given the persistent warm and dry conditions continued
caution is highly encouraged.
Onshore flow will strengthen later this evening as a stronger push
of marine air enters western Washington. Very isolated areas of 20-
25% min RHs are possible in the Cascade valleys on Saturday but
widespread concerns are not expected - alleviating the threat for
elevated fire weather concerns. More benign fire weather conditions
will emerge on Sunday and lead into into the middle next week.
Cooler temperatures and increased moisture with much better humidity
recoveries are expected across the region.
41
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Heat Advisory until 10 PM PDT this evening for City of Seattle-
Downtown Everett / Marysville Area-Eastside-Foothills and
Valleys of Central King County-Foothills and Valleys of
Pierce and Southern King Counties-Foothills and Valleys
of Snohomish and Northern King Counties-Foothills and
Valleys of the North Cascades-Lowlands of Pierce and
Southern King Counties-Lowlands of Western Skagit and
Northwestern Snohomish Counties-Lowlands of Western
Whatcom County-Shoreline / Lynnwood / South Everett Area.
PZ...Small Craft Advisory until 3 AM PDT Saturday 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