Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
671
FXUS66 KSEW 301033
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
333 AM 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 mainly mountain showers. 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.
&&
.SHORT TERM /TODAY THROUGH THURSDAY/...
Satellite imagery shows cloudy skies over the lowlands of
Western Washington this morning. Temperatures at 3 am/10z were
in the 50s.
Little change in the pattern for the next three days. Weak upper
level trough over the area with onshore flow through Thursday.
The onshore flow will keep plenty of low level moisture over
the area resulting in cloudy mornings with slight clearing in
the afternoon. Could see a light shower or a little drizzle in
the lowlands during the morning commute along with a light late
day shower in the mountains. Temperatures will remain well below
normal with highs in the upper 50s to mid 60s. Lows in the
upper 40s to mid 50s. Felton
&&
.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/...
Weakening front fizzles out as it moves into the area Thursday
night. Weak trough overhead gets replaced by zonal flow aloft
beginning Friday with the zonal flow aloft continuing into
Sunday. 500 mb heights rising over the weekend into the mid to
upper 570s dms. Low level flow remaining onshore which will keep
temperatures from warming too much. Warmer Friday with highs in
the mid 60s to mid 70s. Temperatures remaining in that range
over the weekend. A little more warming Monday as an upper level
trough digs well offshore turning the flow aloft southwesterly.
Highs Monday in the 70s over the interior with the warmer
locations pushing 80. Highs on the coast with the continued
onshore flow in the mid 60s.
&&
.AVIATION...
Troughing inland is keeping northwesterly flow present through the
TAF period. Most locations are at least under MVFR ceilings with
KPWT under IFR conditions. KBLI VFR at 11z. There is a 75%-80%
probability KBLI ceilings lower to MVFR by 15z. Conditions will
once again improve to VFR ceilings through the late morning and
afternoon. South to southwest winds 5-10 kt will continue
through the TAF period as well.
KSEA...MVFR cigs are at the terminal this morning. Periods of
IFR cannot be ruled out, with a 65-70% probability of IFR
ceilings 14z-17z. The pattern repeats today with a slow lift of
cigs up to VFR in the afternoon with some breaks in the
cloud cover. Southwest winds 5-10 kt will continue today.
&&
.MARINE...
Broad high pressure will continue over the northeast Pacific
with lower pressure inland. High pressure will weaken Thursday
as a low moves towards the British Columbia coast with a weak
front over the coastal waters. High pressure will rebuild later
Friday into the weekend.
Small craft advisory for the outer coastal waters through
Wednesday. Small craft advisory winds today and tonight with
seas 10 to 13 feet. Winds and seas easing Wednesday but seas
still near 10 feet.
Small craft advisory for the inner coastal waters through
tonight for choppy seas 9 or 10 feet with a 9 or 10 second
period. Felton
&&
.FIRE WEATHER...
Little in the way of fire weather concerns in the week ahead.
Upper level troughing maintaining cool conditions with high
relative humidity values and a slight chance for showers through
Thursday. Drier and more seasonable temperatures beginning
Friday continuing into early next week. Low level onshore flow
will keep good humidity recoveries going in the late night and
morning hours. Felton
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...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