707
FXUS66 KSEW 120926
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
226 AM PDT Sat Jul 12 2025

.SYNOPSIS...Upper ridging over the area this weekend will keep
conditions warm and dry across western Washington. A brief
reprieve in temperatures is possible on Monday as a system slides
southward along British Columbia and skirts the area. Another warm
up is expected Tuesday through Thursday, with highs potentially
reaching the 90s for some lowland locations.

&&

.SHORT TERM /TODAY THROUGH MONDAY/...Broad high pressure over the
West will keep western WA warm and dry through the weekend and
early next week, with Minor to Moderate Heat Risk. Interior
temperatures will be in the upper 70s to mid 80s today, and 80s to
lower 90s on Sunday. Lows will be in the mid 50s to around 60. The
coast will be cooler and in the 60s with NW onshore winds. Weak
upper level troughing over B.C. will help knock temps down
a few degrees on Monday. 33

.LONG TERM /TUESDAY THROUGH FRIDAY/...Strong high pressure is
anchored offshore next week, deflecting any precip to our north,
while maintaining a warm a dry air mass over the region.
Temperatures will peak on Wednesday and Thursday with daytime
highs in the 80s to lower 90s and lows in the 60s. Much on the
interior and Cascade valleys will be in a Moderate Heat Risk
category. Elevated fire weather conditions are also expected with
minimum humidity percentiles in the 20s and 30s. Troughing over
B.C. will push temps down a few degrees late in the week (but
still tracking warmer than normal). No precip in sight. 33

&&

.AVIATION...Northwesterly flow aloft as an upper level ridge
slides over western Washington. Some high level clouds will move
over the area this morning along with marine stratus slowly
spreading from the coastline. MVFR/IFR conditions can be expected
early this morning throughout interior terminals generally around
12z-15z. Stratus will begin to retreat back to the coastline
around 18z-20z, with VFR conditions returning to all terminals.
Light northerly winds increasing to 8 to 12 knots this afternoon.

KSEA...VFR conditions early this morning. Marine stratus will
start to inch towards the terminal early this morning around
12z-14z as latest guidance shows a 40% chance of conditions
lowering to MVFR, with a possibility of brief IFR conditions as
well (15%). VFR will resume around 17z-19z, with northerly winds 8
to 12 knots throughout the afternoon.

Mazurkiewicz

&&

.MARINE...Surface high pressure continues offshore with low level
onshore flow through the area waters. A Small Craft Advisory
remains for the Central and Eastern Strait until early this
morning. Diurnally driven pushes will continue through the Strait
into early next week. Northerly winds will increase over the
outer coastal waters Sunday night with the potential to reach
small craft advisory strength.

Combined seas 4 to 6 feet will gradually increase to around 6 to
8 feet late Sunday into Monday. Seas look to remain elevated for
the first half of next week.

Mazurkiewicz

&&

.FIRE WEATHER...More robust onshore flow this weekend will help
usher in more moist air with min RHs back into the 30% to 40%
range, despite high temperatures remaining in the 80s. A trough
looks to edge towards the region on Monday, which will allow for a
brief reprieve with slightly cooler temperatures.

Fire weather concerns remain elevated next week with above normal
temperatures and fuels further drying. Minimum RHs in the 20s and
30s are possible both Wednesday and Thursday for much of the
interior and Cascades.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Small Craft Advisory until 6 AM PDT early this morning for
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance
     U.S. Waters Strait Of Juan De Fuca.

     Small Craft Advisory until 5 AM PDT early this morning for
     Admiralty Inlet.

     Small Craft Advisory until 2 AM PDT early this morning for
     Coastal Waters From James Island To Point Grenville Out 10
     Nm-Coastal Waters From Point Grenville To Cape Shoalwater
     Out 10 Nm.

&&

$$