748
FXUS66 KSEW 192146
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
146 PM PST Wed Nov 19 2025

.SYNOPSIS...
A weak front will move inland tonight into early Thursday but
will fall apart as it does so. Some chances for rain on the
coast tonight but will become mostly dry by the time it moves
inland. Broad high pressure rebuilds Friday across the south
while a weak system over B.C. brings back showers chances to the
northwest portion of the area. A stronger system will bring
more substantial chances for rain and mountain snow area-wide
Sunday into Monday. Cooler and drier conditions expected Tuesday
into the middle of next week.

&&

.SHORT TERM /TONIGHT THROUGH FRIDAY NIGHT/...
An upper level ridge will continue to shift eastward as an
elongated trough moves towards the region tonight into Thursday.
This will bring an associated surface front towards the coast
tonight, but it is expected to rapidly weaken as it moves
inland. This will allow for easterly gap winds to east tonight. There
will be chances for light rain along the coast tonight, but
little in the way of precipitation is expected for the rest of
the area through early Thursday morning. Most of the rest of the
day should remain dry. Temperatures Thursday will be a bit
warmer, with highs in the low to mid 50s and lows in the upper
30s to low 40s. On Friday, the jet stream strengthens and takes
aim at British Columbia. This will bring renewed chances for
rain for the far northwestern portions of the region starting
Friday, for places including the northwestern tip of the Olympic
Peninsula, the North Cascades, and Whatcom County, while the
rest of the area should remain mostly dry. Snow levels above
5-6000 ft will keep snow accumulations confined to the highest
peaks. Temperatures should also remain similar compered to
Thursday.

Along the coast, large long-period swells will arrive on
Thursday. The current forecast keeps conditions just short of
high surf criteria, but will need to continue to be monitored
for the potential for an advisory. Regardless, localized beach
erosion and significant wave run-up may be possible on Thursday.

&&

.LONG TERM /SATURDAY THROUGH WEDNESDAY/...
The overall upper air pattern remains consistent from Friday
into Saturday until an embedded shortwave trough moves through
the area on Sunday. This will generate a surface system that
will bring the most substantial chances for precipitation across
the area that will linger into. Snow levels will lower to around
3000 to 4000 ft Sunday night, allowing for accumulating snow
across most of the mountain passes into Monday. Confidence is
beginning to increase for a cooler and drier trend for the first
half of next week with highs sinking into the 40s and lows in
the 30s. Many locations could se lows below freezing by Tuesday
night.

62

&&

.AVIATION...
High pressure shifts east tonight while a trough
digs along the coast. The flow aloft is southerly. Increasing
clouds overnight with light rain and MVFR conditions Thursday
morning. VFR conditions returning by 21z with drier conditions.

KSEA...VFR tonight with easterly winds to 10-15kt. Increasing
clouds with MVFR and light rain by 12z. Cigs gradually improving
with VFR returning by 18-21z. 33

&&

.MARINE...
E/SE offshore flow tonight with highest wind/seas over
the coastal waters and entrances to the strait. Winds will ease
early Thursday. Meanwhile, seas will build to 13 to 17 feet
Thursday afternoon. Southerly winds prevail over the waters
Friday and into the weekend. A stronger push down the strait is
forecast Sunday night and Monday with gales possible. 33

&&

.HYDROLOGY...
No flooding is expected through the week ahead. Stronger weather
systems moving into the region early next week could bring periods
of heavier rain (or mountain snow) and will be the next time frame
to watch with respect to hydrologic concerns.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...Wind Advisory until 10 PM PST this evening for Foothills and
     Valleys of Central King County.

PZ...Small Craft Advisory until 4 AM PST Thursday 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-West Entrance U.S.
     Waters Strait Of Juan De Fuca.

     Small Craft Advisory from 6 PM this evening to 10 AM PST
     Thursday for East Entrance U.S. Waters Strait Of Juan De
     Fuca.

&&

$$