FXUS66 KSEW 081559
AFDSEW

Area Forecast Discussion
National Weather Service Seattle WA
859 AM PDT Wed Jul 8 2026

.SYNOPSIS...
Onshore flow will lead to mild weather across western 
Washington this week and into the weekend. Expect a slight 
chance of showers in the Olympics and northern Cascades. Drier 
and warmer conditions are forecast early next week as high 
pressure builds over the western US.

&&

.SHORT TERM /TODAY THROUGH FRIDAY/...
A weak/dry front is passing through western WA early this 
morning with increasing onshore flow. This onshore push will 
bring cooler conditions to the region and keep temperatures 
closer to average. Expect highs in the lower to mid 70s in the 
interior with 60s along the coast. Highest winds will be through
the strait. 

Low pressure will remain over B.C./Alberta on Thursday with 
zonal flow over WA. Ongoing onshore flow will result in morning 
clouds with afternoon sunbreaks. Temperatures will track close 
to seasonal averages. 

On Friday, the low will shift W/SW and offshore and the flow 
aloft will become more southwesterly. A moisture tap will bring 
a few high-based showers to the Olympics and northern Cascades.
The chance for wetting rains is low, though. The chance for 
thunderstorms is low too (less than 10 percent). 33

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
Low pressure will linger offshore through the weekend, keeping 
western WA slightly cooler and mild. There's a slight chance of 
showers again in the Olympics and northern Cascades although 
total rainfall is low. The low ejects northeastward and heights 
build early next week as strong high pressure forms over the 
western/central CONUS. Warmer temperatures are expected with 
highs reaching the lower to mid 80s in the interior on Monday 
and Tuesday. The coast will remain cooler and in the 60s due to 
NW winds. 33

&&

.AVIATION...
This morning holds more MVFR/IFR ceilings as stratus is present 
across most of the area. Ceilings are expected to improve to VFR 
behind a front between 18Z-21Z. Winds will turn northerly this 
afternoon. There is a 60-80% probability for at least MVFR ceilings 
to return to the coast starting at 08Z Thursday, and a 15-25% 
probability inland near Seattle.

West to southwest winds will turn more north in the late afternoon/
early evening today.

KSEA...MVFR ceilings will continue through this morning while 
gradually improving to VFR. Smoke aloft is possible due to regional 
wildfires. Convergence behind the front look to keep ceilings in the 
picture through much of the day.

Southwesterly winds turn northerly this afternoon and remain near 4 
to 8 knots, easing again overnight.

&&

.MARINE...
Onshore flow will prevail through the remainder of the week and
weekend. Highest wind/waves will be found through the Strait of
Juan de Fuca during the afternoon and evening hours. Gales or 
Small Craft Advisory westerly winds are expected through the 
strait each day. 33

&&

.FIRE WEATHER...
Onshore flow will lead to near average temperatures and higher 
humidities, thus keeping the overall fire weather danger low. 
Dry and warmer conditions are forecast early next week although 
minimum humidities will not reach critical thresholds.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...None.
PZ...Gale Warning from 2 PM this afternoon to 5 AM PDT Thursday for 
     Central U.S. Waters Strait Of Juan De Fuca-East Entrance 
     U.S. Waters Strait Of Juan De Fuca.

&&

$$