Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
706
FXUS66 KSEW 192252
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
352 PM PDT Thu Jun 19 2025
.SYNOPSIS...Wet and cooler weather returns Friday and Saturday as
an upper level low moves overhead. Mountain snow is expected
above 5000 ft. Warm and dry conditions return early next week.
&&
.SHORT TERM /TONIGHT THROUGH SUNDAY/...A dry a mild day for
western WA today with temperatures in the 60s to lower 70s - right
around average. A deep upper low with shift inland Friday and
Saturday leading to cooler and wetter conditions across western
WA. Through Saturday, total rainfall ranges from around
0.25-0.50" in the lowlands with 0.50-1.00" in the mountains and
foothills. The air mass will be unstable Friday afternoon for a
chance of thunderstorms over SW WA too. The wettest period will be
Friday night and Saturday morning. Up in the mountains, snow
levels will drop to around 5000 ft with a few inches of snow on
the higher peaks. Forecast highs both Friday and Saturday are only
around 60 degrees, or around 10 degrees cooler than average for
the interior.
The upper low will weaken and shift farther east on Sunday. We may
still see a few light, lingering showers in the interior and
Cascades but we`re only expecting an additional trace to a few
hundredths (if anything). The air mass will moderate a little bit
with highs tracking closer to average again. 33
.LONG TERM /MONDAY THROUGH THURSDAY/...Weak high pressure brings
warmer and drier weather back to western WA early next week.
Temperatures in the interior will reach the mid/upper 70s to
lower 80s in the interior (peaking on Tuesday). The coast will be
cooler and in the 60s with northwest flow. Showers return mid to
late week with troughing over the Pac NW. 33
&&
.AVIATION...A mix of mid and upper level clouds throughout western
Washington this afternoon, for VFR cigs across all terminals.
Surface winds are predominately northwesterly, gusty through the
Strait of Juan de Fuca and portions of Puget Sound. Changes are in
store for tomorrow afternoon and evening as a frontal system enters
the region, bringing rain and MVFR cigs to most terminals.
KSEA...VFR presently at the terminal, with breezy northerly winds
gusting to 15 kts. Some leftover SCT clouds at 040 or higher remain
in place, with periodic BKN to the north around BFI. Winds will
remain northerly and between 7 to 10 kts through 05Z, transitioning
to a southwesterly wind ahead of the front around 07Z at 8 to 10
kts. Rain showers are likely after 18Z Friday.
21
&&
.MARINE...High pressure over the waters will weaken tonight. Low
pressure system tracking across the waters Friday into Saturday.
Expect widespread rain over the area waters, with possible small
craft advisory wind and seas over the outer coastal waters on
Saturday.
Westerly push through the Strait of Juan de fuca tonight with small
craft advisory winds in the Central and Eastern portions. Maintained
the forecast of 20 to 30 kts through Friday morning.
21
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 6 PM this evening to 6 AM PDT Friday
for Central U.S. Waters Strait Of Juan De Fuca-East
Entrance U.S. Waters Strait Of Juan De Fuca.
&&
$$
NWS SEW Office Area Forecast Discussion