Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
926
FXUS66 KSEW 310344
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
844 PM PDT Fri Oct 30 2026
.SYNOPSIS...An upper level low will continue to weaken into
Saturday, with drying and cooling conditions through the
weekend. Upper level ridging will build through the first half
of next week for continued dry conditions, before additional
systems look to arrive by midweek.
&&
.SHORT TERM /TONIGHT THROUGH SUNDAY NIGHT/...Showers continue to
taper off this evening, with a few lingering showers over
western Washington. An upper level low will start to move
southwards and weaken, taking away the showery influence over
western Washington. We`ll start a dry and cool trend heading
into the weekend, with afternoon temps staying in the low 50s.
Overnight lows, especially tonight into Saturday morning, will
cool, with areas in the Southwest Interior seeing below freezing
temperatures in the upper 20s and low 30s. Therefore, a Freeze
Warning is in effect for those locations. A Frost Advisory has
also been issued for the northern Olympic Peninsula and north of
Seattle as temperatures are expected to range between 32 to 36
early Saturday. Take the proper precautions to protect
vegetation if needed. Besides the cold temperatures, should be
dry for any trick or treaters.
Dry and cool conditions through Sunday over the region.
Overnight low temperatures will be flirting with freezing
temperatures as well, in the low 30s.
Mazurkiewicz
&&
.LONG TERM /MONDAY THROUGH FRIDAY/...Ensemble guidance remains
in reasonably good agreement for the first half of next week
with an upper ridge remaining generally over the region for the
start of next week. This will maintain mostly dry conditions,
though a portion of ensemble members bring a weak disturbance
into the ridge enough to bring some light precipitation chances
(20-30%) west of Puget Sound. Another weak disturbance brings
similar chances toward midweek. A more notable shift in the
pattern becomes more likely late in the week with a stronger
front approaching Western Washington, but it`s worth noting that
there`s significantly increasing spread in the potential
evolution of the pattern by that time. Cullen
&&
.AVIATION...South to southwest flow aloft continues into
Saturday as upper level low offshore digs southward into the
Oregon and northern California offshore waters. The low level
flow will turn light overnight. Coupled with areas of clearing,
this will be conducive to the formation of IFR or LIFR low
clouds and surface visibility locally below 3 statute miles by
early morning. Low clouds are expected to lift and scatter out
for most areas 18Z-20Z Saturday.
KSEA...Last remaining showers will pass through this evening before
some clearing takes place near or after 05Z. With surface moisture
and light winds, this remains a favorable scenario for IFR low
clouds to form. Low clouds should scatter out to VFR again around
20Z Saturday afternoon. Surface winds light and variable becoming
E/NE under 7 knots toward 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. Southeasterly winds over the coastal waters
this afternoon will reach 15 to 20 kts at times, but should
remain under small craft advisory criteria. Winds look to remain
generally benign and light across the area waters through the
first half of next week.
Coastal seas 4 to 6 feet through the weekend. Seas will build to
slowly build late Sunday into Monday, back around 10 to 11 feet
as a larger swell train approaches.
Mazurkiewicz
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Frost Advisory from midnight tonight to 9 AM PDT Saturday for
Downtown Everett / Marysville Area-Eastern Kitsap County-
Eastern Strait of Juan de Fuca-Eastside-Foothills and
Valleys of Central King County-Foothills and Valleys of
Snohomish and Northern King Counties-Foothills and
Valleys of the North Cascades-Lake Crescent Area
Including US 101-Lowlands of Western Skagit and
Northwestern Snohomish Counties-Lowlands of Western
Whatcom County-Shoreline / Lynnwood / South Everett Area-
Western Strait of Juan de Fuca.
Freeze Warning from midnight tonight to 9 AM PDT Saturday for
Lowlands of Lewis and Southern Thurston Counties-Middle
Chehalis River Valley.
PZ...None.
&&
$$
NWS SEW Office Area Forecast Discussion