962
FXUS66 KSEW 040318
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
815 PM PDT Tue Jun 3 2025

.UPDATE...Clouds associated with incoming shortwave embedded within
the large scale ridge over the eastern Pacific making it to the
coast this evening, but clear skies remain in place over the
remaining two-thirds of western Washington. These clouds will slowly
seep over the CWA overnight and Wednesday morning. Will not be quick
enough to avoid another cool morning for locations east of the
Sound. Inherited forecast on track. No need for an evening update.

&&

.SYNOPSIS...The overall pattern will remain generally dry and
warm through the period. Temperatures will remain near to
slightly above normal through Saturday, then trend warmer late
in the weekend through the start of next week.

&&

.SHORT TERM /TONIGHT THROUGH THURSDAY NIGHT/...The upstream
upper level ridge remains anchored over the eastern Pacific.
This will maintain the generally dry and mild conditions across
the region through midweek. A weak disturbance riding over the
ridge Wednesday will bring some increased clouds and boost low
level onshore flow. This will knock a few degrees off of the
high temperatures Wednesday, and perhaps support enough lift to
result in some light morning drizzle along the coast. Low level
onshore flow weakens Thursday, while the upper level ridge
begins to build into Western Washington will likely make
Thursday the warmest day of the next three with highs reaching
into the upper 70s for parts of the interior and mid to upper
60s along the coast.

&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...A second, similarly dry
weak system riding the upper level ridge will brush Washington
on Friday. This will similarly boost onshore flow, bring a bit
more widespread cloud cover and cooler afternoon temperatures.
Medium rang ensemble guidance continue to show the upper level
ridge slowly building along the West Coast into British Columbia
Sunday. Weak onshore flow and the high pressure aloft will
support afternoon high temperatures well into the 80s for much
of the interior and near 70 for the coast. Some locations South
of Puget Sound/Hood Canal and along the Cascade foothills have a
60-70% chance of temperatures reaching into the low 90s Sunday
afternoon. This would correspond to another round of moderate
(Orange) HeatRisk values for next weekend - affecting individuals
sensitive to heat especially those without effective cooling
and/or adequate hydration.

&&

.AVIATION...Northwest flow aloft will continue as an upper level
ridge remains situated offshore. VFR for inland terminals currently
but, increasing low level onshore flow tonight will bring MVFR
marine stratus into the interior generally starting around 10-12z
Wednesday and continuing into the early part of the afternoon. Areas
long the coast will likely experience lower ceilings around IFR.
Latest guidance depicts stratus dissipating around 20z-22z Wednesday
for most interior areas - for a return to VFR.

KSEA...VFR continuing for the remainder of the evening. Surface
winds N/NW 7 to 9 knots backing to more southerly winds tonight.
Increasing onshore flow tonight will bring in marine stratus to the
terminal starting around 10-12z Wednesday and likely continuing
until 20z where VFR will return.

&&

.MARINE...Surface high pressure will continue to remain offshore
throughout much of this week. Weaker systems passing along the
periphery of the high will lead to varying degrees of onshore
flow.

Small craft advisories remain in effect for the outer coastal
waters for gusty northwest winds, and for the Central and Eastern
Strait of Juan De Fuca for onshore westerlies.

Combined seas are generally hovering around 7 to 9 feet this
evening and will generally subside to 5 to 7 feet through the
end of the week.

Mazurkiewicz

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 3 AM PDT Wednesday for Central U.S.
     Waters Strait Of Juan De Fuca-East Entrance U.S. Waters
     Strait Of Juan De Fuca.
     Small Craft Advisory until 2 AM PDT Wednesday for Coastal
     Waters From Cape Flattery To James Island 10 To 60 Nm-
     Coastal Waters From James Island To Point Grenville 10 To
     60 Nm-Coastal Waters From Point Grenville To Cape
     Shoalwater 10 To 60 Nm.

&&

$$