Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
222
FXUS66 KSEW 301951
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
1251 PM PDT Tue Jun 30 2026
.SYNOPSIS...
A broad upper level trough will continue to produce mostly
cloudy and cool conditions across Western Washington into
Thursday along with chances for light showers over the mountains
and along the coast. Drier conditions and a small warming trend
are expected Friday into the holiday weekend as the flow aloft
becomes first more zonal then southwesterly by Monday.
Temperatures will return closer to normal with more chances for
sun.
&&
.SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/... Fairly
widespread stratus persists early this afternoon across the
lowlands with a few breaks in the cloud deck noted across the
Strait of Juan de Fuca and near Everett. Additional slow
improvement with increasing cloud breaks is expected through the
afternoon hours, though complete clearing is unlikely. With
additional afternoon filtered sunshine, still anticipate high
temperatures reaching into the mid and upper 60s across the
Puget sound and near 60 along the immediate coast. With
nightfall, a return of overnight stratus and drizzle is expected
with partial afternoon clearing on Wednesday, overall very
similar weather to conditions today. On Thursday into Thursday
night...a slightly stronger shortwave will push into British
Columbia and drag a weak cool front into Western WA, which will
result in enhanced light rainfall chances across the coastal
zones and the Olympics, and a deepened marine layer across the
Puget Sound for much of the day. Otherwise, seasonably cool
conditions will persist.
&&
.LONG TERM /FRIDAY THROUGH TUESDAY/...
The weather pattern will begin to transition on Friday into the
weekend as heights slowly begin to rise in response to strengthening
high pressure across the Western US. This will allow for the daily
stratus layer to gradually thin out and burn off earlier in the day,
and a slow warming of temperatures through the weekend back to near
seasonal normals. Additional warming is anticipated heading into
next week as high pressure amplifies over the interior West, with
temperatures climbing above normal.
Outler
&&
.AVIATION...
A broad upper level trough over the west coast will maintain
northwesterly flow aloft. MVFR stratus continues to blanket much
of the region, but a few breaks through the Strait of Juan de
Fuca and along portions of the coast are noted and VFR
conditions are beginning to return there. Expect the stratus to
continue to slowly break up this afternoon and may lift to low-
end VFR between around 22Z Tue - 00Z Wed. A brief period of VFR
conditions through the late evening will be followed by the
redevelopment of the stratus and ceilings lowering to MVFR with
localized areas of IFR possible as the pattern continues into
Wednesday. South to southwest winds 5 to 10 kt will continue
through the period.
KSEA...MVFR stratus will continue to lift this afternoon and
become broken, for a brief period of low-end VFR cigs this
evening. The pattern will continue overnight of redeveloping
MVFR cigs, with the potential for some IFR conditions, in
particular between 14-17Z Wed morning. South to southwest winds
5 to 10 kt will continue through the period.
62
&&
.MARINE...
Broad high pressure will continue over the northeast Pacific
with low pressure inland, maintaining strong northwesterly winds
over the coastal waters, as well as steep, choppy seas up to
10-13 ft with a dominant period of 9 to 10 seconds. This will
continue through tonight until winds and seas begin to ease
during the day Wednesday. This will be due to a low pressure
system forming and moving into the central B.C. coast with a
weak frontal system that will move through the coastal waters on
Thursday. High pressure will rebuild Friday into the weekend.
Diurnal westerly pushes down the Strait of Juan de Fuca will
continue through much of the week and into the weekend. Winds
will be rather marginal with wind gusts up to 25 kt tonight,
through stronger pushes are expected each day and going into
the weekend for additional Small Craft Advisories likely.
62
&&
.FIRE WEATHER...
Little in the way of fire weather concerns in the week ahead.
Upper level troughing maintaining cool and cloudy conditions
with high relative humidity values and a slight chance for
showers along the coast and mountains on Thursday. Drier,
sunnier, and more seasonable temperatures will begin Friday
continuing into early next week. Low level onshore flow will
moderate daytime minimum RH values and bring in good RH recovery
each night.
Felton/62
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 5 PM this afternoon to 5 AM PDT
Wednesday for Central U.S. Waters Strait Of Juan De Fuca-
East Entrance U.S. Waters Strait Of Juan De Fuca.
Small Craft Advisory until 5 AM PDT Wednesday for Coastal
Waters From Cape Flattery To James Island Out 10 Nm-
Coastal Waters From James Island To Point Grenville Out
10 Nm-Coastal Waters From Point Grenville To Cape
Shoalwater Out 10 Nm.
Small Craft Advisory until 6 PM PDT Wednesday for Coastal
Waters From Cape Flattery To James Island 10 To 60 Nm-
Coastal Waters From James Island To Point Grenville 10 To
60 Nm-Coastal Waters From Point Grenville To Cape
Shoalwater 10 To 60 Nm.
&&
$$
NWS SEW Office Area Forecast Discussion