Brier Weather Station
Latitude N 47° 46' 49" Longitude W 122° 16' 48" Elevation 341 ft
501
FXUS66 KSEW 030337
AFDSEW
Area Forecast Discussion
National Weather Service Seattle WA
837 PM PDT Tue Jun 2 2026
.SYNOPSIS...A ridge will weaken tonight with the low level flow
turning onshore. Upper level trough moving through on Wednesday.
Cold upper level low moving into the area Friday and Saturday
for showers and a chance of thunderstorms. Weak troughing over
the Pacific Northwest early next week with temperatures close to
average.
&&
.SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/...Latest satellite
imagery already shows clouds moving back into western Washington
tonight. The switch back to onshore flow will bring more moisture
and cooler conditions and to the region on Wednesday, helping
alleviate fire weather conditions. Highs will track a good 15-20
degrees cooler than today with highs in the 60s to lower 70s. A
trough will bring a few showers to the coast and mountains too.
The air mass will be slightly unstable over the North Cascades
where there`s a slight chance of afternoon thunderstorms (near
the crest).
Thursday is dry but we remain under onshore flow. Expect morning
clouds with afternoon sunbreaks and highs near average. 33/14
&&
.LONG TERM /FRIDAY THROUGH TUESDAY/...A deep low will spin off
B.C on Friday then shift inland on Saturday, keeping the weather
cool and showery over western WA. Highs both days are only
around 60 degrees with morning lows in the 40s. The air mass
will be cool and unstable with a chance of thunderstorms Friday
night and again Saturday afternoon. Showers with a Puget Sound
Convergence Zone are expected on Saturday in the interior with a
threat of thunderstorms. Shower activity will taper down
Saturday night as the low exits east and weak high pressure
moves in from the west. This ridge keeps us mainly dry moving
into Sunday. Looking ahead, weak upper level troughing over the
region will bring a chance of showers with temperatures close
to average early next week. 33
&&
.AVIATION...Widespread VFR across the terminals this evening with
some high clouds passing through. An incoming frontal system will
lead to an increase in mid to high clouds tonight. Ceilings will
gradually decrease overnight into the morning hours, however the
majority of terminals are expected to remain VFR. The only
exception, being terminals along the coast. Ceilings will
deteriorate along the coast late tonight to MVFR. Latest guidance
suggests there is a 20-30% chance of IFR/LIFR cigs between 06z-10z.
There is an isolated risk (15-20%) of thunderstorms for the northern
Cascades Wednesday evening. However, not expecting any impacts to
any of the terminals. WNW winds will continue today, with more
widespread SW winds returning after 06z. Onshore flow will increase
Wednesday morning, after 10z. Gusts between 15-20 kt possible for
Puget Sound and Northern Interior terminals.
KSEA...VFR conditions will continue through Wednesday. Mid to high
cloud cover expected to increase tonight. WNW today 4-6 kt. Winds
have transitioned more southerly so far this evening. Guidance
continues to highlight increased SW winds between 10z-16z, with
gusts to 15 kt possible (70-80% chance).
29/41
&&
.MARINE...
High pressure will continue to weaken this evening as a cold front
is expected to move over area waters on Wednesday. Diurnal pushes
across the Strait of Juan de Fuca will occur throughout the week.
Latest guidance suggests that the strongest push will be Thursday
evening with high-end small craft winds likely. The chance for gales
remains low, with current chances remaining at 10%. Additional
systems are expected to move over the waters late in the week and
into the weekend. An upper level low will track over the waters
Friday through Saturday, leading to an unstable airmass.
Consequently, there is a small chance (15-20%) of thunderstorms. As
for Friday, thunderstorms are possible for all area waters, with the
highest chances for the coastal waters. As the low pushes inland on
Saturday, the chances of thunderstorms shifts to the interior
waters, with the highest probabilities for Puget Sound.
29/41
&&
.FIRE WEATHER...A flip to onshore flow tonight will bring cooler
conditions on Wednesday with higher RHs, alleviating fire weather
conditions across western Washington through the second half of
the week. 33/14
&&
.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory from 2 AM Wednesday to 11 AM PDT Thursday
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