FXUS66 KSEW 262230

AFDSEW



Area Forecast Discussion

National Weather Service Seattle WA

330 PM PDT Thu Jun 26 2025



.SYNOPSIS...A passing frontal system will bring light showers across 

western Washington through Friday. High pressure will build over the 

region this weekend into early next week, bringing a sharp rise in 

daytime high temperatures, peaking on Monday. This ridge will begin 

to weaken some going into the new week with temperatures cooling 

slightly and a few more clouds.



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.SHORT TERM /TONIGHT THROUGH SUNDAY/...Pretty cloudy this

afternoon across all of western WA (seen on satellite). The next 

shortwave trough is on its way inland (just offshore as of writing). 

It is driving a surface low pressure system that is expected to 

bring an occluding front through the region later today into Friday. 



The radar has a couple areas of showers moving through the region.

A quick "waiver" pre-event round of showers is moving through the 

north Cascades and parts of Whatcom/Skagit Counties. A more 

widespread line of rain showers is approaching the coastline this 

afternoon. It is expected to move across all of western WA during 

the late afternoon and evening hours. Cloud coverage is going to 

remain relatively intact Friday morning as another round of showers 

moves through in the afternoon and evening. Most of the showers will 

wrap up by Saturday morning. Precipitation amounts will be 

relatively light across the region, with totals being several 

hundredths of an inch of rain (couple areas in the north Cascades 

may get a couple tenths of an inch). Highs today and Friday will 

remain cool (50s and 60s), with a few 70s by Saturday in and south 

of Puget Sound.



The rest of the weekend will be dry as an upper level ridge builds 

over the Pacific Northwest (and as high pressure builds offshore).

The skies will begin to clear out Saturday evening across the 

region, with Sunday being relatively clear. Some of the temperatures 

will climb into the low 80s (particularly in South Puget Sound and 

in some Cascade Valley areas). Remaining areas will see highs in the 

60s and 70s. HeatRisk will remain minor (yellow) on Sunday. Winds 

will remain light through the period, but there could be some breezy 

north winds through Puget Sound Sunday afternoon (up to 20 mph). 



.LONG TERM /MONDAY THROUGH THURSDAY/...High pressure will continue

into Monday, with Monday expected to be the warmest day of the week 

with clear skies. The warmer spots South Puget Sound and Cascade 

Valley areas) may see highs approach upper 80s to low 90s.

This will uptick the HeatRisk into moderate (orange) in these areas. 

After Monday, the ridge is expected to break down and move east, 

giving way to a more zonal/dry flow pattern across the region. 

Temperatures will cool down slightly into the upper 70s/low 80s for 

highs through the week. There does not appear to be any chance of 

moisture next week (although a couple ensembles hint at a possible 

trough just after the 4th of July). 



HPR



&&



.AVIATION...Abundant cloud cover as a weak system continues to push 

across Western Washington this afternoon, with rain showers 

pushing inland. A mix of ceilings ranging from VFR to MVFR this 

afternoon. Reduced visibility possible as well as the rain showers

move over the terminals. Ceilings along the coast are unlikely to

improve this afternoon/evening. Another weak system is expected 

to move over the terminals Friday morning, bringing the chance of 

scattered light showers after 15z. Area-wide MVFR expected to 

start late tonight/early Friday morning. Terminals along the coast

and Strait of Juan de Fuca have the potential to see IFR 

ceilings, with a 30%-40% chance. Improvement into low-end VFR 

possible after 20z-23z for the interior terminals.



KSEA...VFR ceilings this afternoon/evening with rain showers. 

Ceilings will decrease early Friday morning into MVFR (around 7z-8z),

with the chance of another round of light scattered showers 

possible Friday morning. Guidance hints at some improvement as 

early as 20z-21z into low-end VFR. Southwesterly winds at 5-8 kt 

through the TAF period. 



29



&&



.MARINE...High pressure will build over the waters late Friday and 

will persist into the weekend, which will lead to northwesterly flow 

over the coastal waters. High pressure will weaken slightly on 

Monday, but will be the dominant feature for next week, keeping 

northwesterly surface flow over the coastal waters. Marine 

conditions look to remain benign through next week. Westerly pushes 

will occur each evening across the Strait of Juan de Fuca, but at 

this time there is not strong signal that sustained wind speeds and 

gusts will meet small craft thresholds. Seas will be 3-4 ft through 

Friday and will increase slightly during the weekend to 4-6 ft, 

persisting into early next week. 



29



&&



.SEW WATCHES/WARNINGS/ADVISORIES...

WA...None.

PZ...None.

&&



$$

