788
FXUS66 KSEW 251031
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
331 AM PDT Sat Jul 25 2026

.SYNOPSIS...
An upper-level trough offshore will push inland today. A weak
front will follow the trough Sunday into Sunday night. Temporary
high pressure Monday before another weak front arrives Tuesday.
Dry and warmer weather Wednesday into next weekend as an upper
level ridge centered over the southwest builds back towards the
Pacific Northwest.

&&

.SHORT TERM /TODAY THROUGH MONDAY/...
Satellite imagery shows clouds from the Puget Sound westward
this morning over the lowlands as well as over the Southwest
Interior. Still mostly clear over the Northwest Interior.
Temperatures at 3 am/10Z were in the mid 50s to mid 60s.

Upper level trough offshore moving through Western Washington
later this morning into the afternoon hours. Best chances for
showers along the coast and over the Northwest Interior. Marine
layer filling in over the rest of the lowlands by mid morning.
Trough moving through will keep the layer intact this afternoon
making for a mostly cloudy day. Temperatures well below normal
with highs in the mid 60s to mid 70s.

Another upper level trough digging south offshore tonight.
Front associated with the trough stalling offshore as the flow
aloft becomes more parallel to the front. Rain developing along
the North Coast with a chance of rain west of Puget Sound.
Under at least mostly cloudy skies lows in the 50s and lower
60s.

Another day of much below normal temperatures Sunday as the
frontal system moves slowly eastward. Rain over the Olympic
Peninsula and the coast with rain likely for the Northwest
Interior. Mostly cloudy to cloudy skies elsewhere. Highs only in
the mid 60s to lower 70s.

Front weakening and moving through Sunday night with a chance of
rain or better from about Chehalis northward. Lows in the 50s.

Another weak trough digging offshore Sunday night into Monday.
This one a little further offshore allowing a weak upper level
ridge to try an build over Western Washington. Chance of showers
west of Puget Sound. With the upper level ridge temperatures
warming a little with highs in the 70s over the interior. Under
mostly cloudy skies high temperatures along the coast in the mid
and upper 60s. Lows Monday morning in the 50s. Felton

&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
One more weak weather system moving through Tuesday ( is it
really the last week of July? ) for another chance of rain.
Highs upper 60s to mid 70s inland and mid 60s coast.

Upper level ridge centered over the Desert Southwest will
begin building towards the Pacific Northwest Tuesday night.
Ridge continuing to slowly build and by Friday 500 mb heights in
the mid to upper 580 dms. Low level flow remain onshore
Wednesday through Friday keeping temperatures from getting too
warm. Highs in the 70s Wednesday warming to the mid 70s to mid
80s Thursday and Friday for the interior. Highs along the coast
in the mid 60s Wednesday, near 70 Thursday and Friday.

Is the current streak of Julys with above normal temperatures
in Seattle ( currently at 13 ) over? Through the 24th the
average temperature for the month is 66.9 degrees, only 0.2
degrees above normal. Current forecast temperatures for the next
week put the July average temperature at 66.9 degrees by the
end of the month. Normal for the month of July is 67.1 degrees.
The last time Seattle had an average monthly temperature in July
below 67.0 degrees was 2016 with 66.8 degrees ( the 1981-2010
normal for July was 65.7 degrees so this was still an above
normal month ). It`s going to be close. Felton

&&

.AVIATION...
Low level onshore flow combined with an upper level trough
moving through with mostly MVFR ceilings this morning improving
to VFR this afternoon over the interior. MVFR ceilings
continuing along the coast. Little change in the ceilings
overnight into Sunday morning.

KSEA...VFR ceilings lowering to MVFR around 14z. MVFR ceilings
continuing through midday lifting to VFR around 21z. VFR
ceilings continuing into Sunday morning. Southwest wind 4 to 8
knots except 8 to 12 knots 21z-03z. Felton

&&

.MARINE...
A stalled front offshore today will move inland Sunday into
Sunday night. High pressure behind the front Monday. Another
front will move into the area waters Tuesday with high pressure
again building in behind the front Tuesday night and Wednesday.

Small craft advisory winds over the coastal waters today easing
tonight. Diurnal westerly pushes through the Strait of Juan de
Fuca in the evenings in the middle of next week could produce
small craft advisory winds. Felton

&&

.FIRE WEATHER...
Fire weather concerns relaxing the next few days with chances
for precipitation over the weekend and again Tuesday. Good
chance of wetting rains along the north coast and the west
slopes of the Olympics Sunday and Sunday night. Dry and warmer
conditions beginning the middle of next week. Low level flow
remaining onshore for good relative humidity recoveries in the
overnight hours. Felton

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 8 AM this morning to 5 PM PDT this
     afternoon for Coastal Waters From Cape Flattery To James
     Island 10 To 60 Nm-Coastal Waters From Cape Flattery To
     James Island Out 10 Nm-Coastal Waters From James Island
     To Point Grenville 10 To 60 Nm-Coastal Waters From James
     Island To Point Grenville Out 10 Nm-Coastal Waters From
     Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal
     Waters From Point Grenville To Cape Shoalwater Out 10 Nm.

&&

$$