Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
355
FXUS66 KSEW 300317
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
817 PM PDT Thu Oct 29 2026
.SYNOPSIS...The low center off Vancouver Island will continue
meandering south through Friday afternoon. As it weakens and
moves inland on Saturday south of the area, conditions will
begin to dry out. An upper level ridge will build on Sunday into
early next week. Weak systems may arrive again by Wednesday.
&&
.SHORT TERM /TONIGHT THROUGH SATURDAY NIGHT/...Showers will
taper down overnight as the offshore upper low shift farther
west and southwest neat 130W. Freeze Watch was expanded to cover
the Middle Chehalis River Valley Friday night. Otherwise, the
rest of the forecast remains on track. 33
Previous discussion...Showers are moving inland throughout
this afternoon as the center of the offshore low very slowly
makes its way south. Some of these showers will produce more
moderate rainfall, and it`s still somewhat unstable, so there
will be a slight chance of thunderstorms through this afternoon.
Minimum temperatures will also be decreasing through Saturday
morning. A Freeze Watch has been issued for the lowlands of
Lewis and southern Thurston counties as overnight lows are
forecast to be in the upper 20s to around 32 degrees. There is a
chance that the middle Chehalis river valley may also need a
freeze headline as lows there are approaching the upper 20s.
Crops and sensitive vegetation may die as a result of
temperatures that low, so take the proper precautions to protect
things like that if needed.
Saturday will be partly sunny and drier, with no precipitation
expected for any of the festivities taking place around the
region. Highs will be in the mid 50s.
&&
.LONG TERM /SUNDAY THROUGH THURSDAY/...Weak ridging will be
building in on Sunday, carrying through to the middle of the
week. A series of weak systems will make it to the area through
the end of the week but at this point are unlikely to create
more than increased cloud cover. Precipitation is not expected
to be significant if it occurs. Conditions will be fairly
homogeneous through the week with periods of clouds and highs in
the mid 50s.
The period of Nov 6 through 12 could feature a return to wetter
conditions, but this will continue to be evaluated as it gets
closer.
21
&&
.AVIATION...An upper level trough will remain over the coastal
and offshore waters into Friday producing south to southwest
flow aloft over Western Washington. Scattered showers continue
across the region this evening with mostly VFR ceilings. An
overall decrease in shower activity is expected
overnight...especially across interior areas. Another impulse
rotating around the trough is expected to push onshore Friday
morning for an increase in shower coverage and periods of MVFR
ceilings. Decreasing showers and improving ceilings are expected
late Friday afternoon or early evening.
KSEA...Ceilings are expected to remain at or above 4000 to 5000 feet
this evening through the overnight hours. A general deterioration to
MVFR ceilings is expected between 15Z and 21Z Friday as showers
increase once again. Surface winds light and variable this evening
will become E/NE generally 7 knots or less overnight into Friday
morning.
27
&&
.MARINE...Weak surface low pressure over the coastal waters
will remain in place into Saturday before dissipating as high
pressure builds across the interior of Western Washington early
in the coming week. East or southeast winds across the coastal
waters and near the west entrance to the strait will
occasionally reach 15 to 20 knots over the next couple of days
until the offshore low finally dissipates. Otherwise, winds into
early next week look to remain rather light across area waters.
Coastal seas are expected to build back to around 10 feet by around
Monday as another larger swell train reaches the waters.
27
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Freeze Watch from late Friday night through Saturday morning
for Lowlands of Lewis and Southern Thurston Counties-
Middle Chehalis River Valley.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion