635
FXUS66 KSEW 291640
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
840 AM PST Sat Nov 29 2025

.SYNOPSIS...
An overall cooler and drier trend will continue into next week,
though a few weak disturbances moving across the area may bring
some additional shower chances at times. A stronger system may
approach western Washington late next week.

&&

.SHORT TERM /TODAY THROUGH MONDAY/...
No major forecast changes have been made this morning. See below
for previous discussion and updated aviation sections.

An upper level ridge building into the northeastern Pacific
this weekend will keep conditions rather calm across western
Washington for the time of year. Overall, expect a cooler and
drier trend through the short term, though weak disturbances
will drop down into the area today and again on Monday under
northwesterly flow aloft. The system today will primarily
increase cloud cover across the area and will keep much of the
area dry, however could see a few light showers pop up as it
moves through- particularly over the mountains. Temperatures
will cool a few degrees through the weekend, with afternoon
highs generally expected to be in the mid to upper 40s across
the interior and upper 40s to low 50s along the coast. Morning
lows will be in the mid to upper 30s today but will fall within
a few degrees of freezing and into the low to mid 30s Sunday and
Monday.

Another disturbance will then drop down into the area on Monday
under the northwesterly flow aloft. At this time,the system
does not look to be very impactful, but does looks to bring
better chances for some more widespread light rain to the
lowlands and light snow to the mountains. Most lowland locations
will likely only see a few hundredths of an inch of rain and
most spots across the mountains will likely only see 1-3 inches
of snow Monday night into Tuesday. Light snow accumulations
will also be possible at the passes.


&&

.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
Precipitation will taper across the area throughout the day
Tuesday. The pattern through the long term will be similar to
that of the short term, with both ensembles and deterministic
guidance suggesting the ridge of high pressure remaining situated
over the northeastern Pacific through much of the week. A few
weak disturbances may drop down into western Washington under
the northerly flow aloft again Wednesday into Thursday, but
expect any precipitation to remain mostly light. Highs will be
in the mid to upper 40s and morning lows will be in the 30s.

The pattern becomes more uncertain later in the week as model
guidance suggests a wetter system making its way into the area
as the ridge over the Pacific weakens. Ensembles hang onto the
amplified ridge a little longer though, so will have to see how
guidance resolves this scenario over the coming days.

14

&&

.AVIATION...
High pressure over the area will keep conditions largely VFR
throughout the day today. Clouds will remain overhead with some
breaks. Expect ENE surface winds to continue today at 4 to 7
kts. Very isolated showers are possible this afternoon, but
should largely be confined to the mountains. With calm winds and
clearer skies, the threat for some low cigs and potential fog
remains in the forecast tonight into Sunday morning,
particularly for the Chehalis Valley and portions of the Kitsap
Peninsula. While it likely won`t be widespread, the threat will
be evaluated in the next TAFs.

KSEA...
Seeing some FEW020 this morning in VFR conditions this morning
with light northeasterly flow. Expect to see those 020 clouds
remain through the morning before giving way to higher level
cloud decks in the afternoon. A slight chance of a shower
remains in the forecast, but most of the showers that develop
should be well outside of the terminal. Surface winds will be
ENE at 4 to 6 kts through the day, increasing slightly to 7 kts
late this evening.

21

&&

.MARINE...
A ridge over the east Pacific will move inland today, with low
pressure further inland moving through. Northeast winds will
continue through Sunday with magnitudes remaining light. Seas
will remain at 6 to 8 ft through next Tuesday. A system will
sneak over the outer coastal waters then, with seas building
back to 8 to 12 ft (higher seas in the outer coastal zones). A
few gusty northwest winds to 25 kt are possible Tuesday with
this system. Towards the end of next week, seas will return to 4
to 6 ft with light winds.

HPR

&&

.HYDROLOGY...
River flooding is not expected over the next 7 days.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...None.

&&

$$