


Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA
Issued by NWS Seattle/Tacoma, WA
554 FXUS66 KSEW 162211 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 311 PM PDT Mon Jun 16 2025 .SYNOPSIS...A series of weak systems are expected to brush the area Tuesday and Wednesday bringing increased cloudiness and a chance of showers to western Washington. More widespread precipitation and cooler temperatures look to be on track Friday into the weekend as the upper low moves onshore over the region. && .SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/...The upper level trough over the eastern Pacific will continue to influence the region through the first half of the week allowing a series of weak systems to brush the area. The first will approach the region on Tuesday, boosting clouds and bringing a chance of light precip/showers mainly to the coast during the day then inland Tuesday night into Wednesday. There is a chance of up to a quarter of an inch of rain is possible particularly over the Olympic Peninsula and across the North Cascades. High temperatures Wednesday will be run a few degrees cooler, with most spots likely only climbing into the 60s, though a few may make it into the low 70s. && .LONG TERM /THURSDAY THROUGH MONDAY/...Thursday continues to look like a transitional day - mostly dry with a few lingering post- frontal showers. The upper level low expected to being to shift onshore Friday into Saturday will bring more widespread rain and cooler temperatures. Rainfall amounts across the lowlands at this time continue to look around a tenth of an inch to a quarter of an inch. Of note snow levels are expected to dip down to 5000-6000 ft over the weekend, bringing the potential for light snow accumulations to the tallest mountain peaks. High temperatures over the weekend will generally trend below normal as a result, with highs only expected to be in the 60s. Those with plans for outdoor recreation in the mountains will want to monitor the forecast for the latest information. && .AVIATION...A weak shortwave trough is moving through western WA this afternoon. A couple light showers north of KPAE are moving across northern terminals (most of it is likely falling as virga/not reaching the ground). High ceilings encompass most terminals this afternoon (cirrostratus/stratus) with some low cumulus in some spots. It`s VFR regionwide this afternoon and will remain so through tonight, with the best chance of MVFR/IFR CIGs Tuesday morning being along the coast. Winds this afternoon are generally southwesterly 5- 10 kt, though some diffluence from a push through the Strait of Juan de Fuca will turn the winds northerly late this afternoon/evening through to terminals along Puget Sound. They will return to south/southwest tonight to around 5 kt, and pick up to 5-10 kt Tuesday. Showers will arrive with a front along the coast Tuesday afternoon, and spread inland in the evening. KSEA...High clouds remaining over the terminal today, some of which will clear in the evening/overnight. Chance of MVFR for Tuesday morning at this time is only 10%. Winds are expected to turn northwesterly after 23-00Z up to 05Z at 5 to 10 kt, before turning back to the south tonight into Tuesday. HPR && .MARINE...High pressure at the surface will weaken tonight into Tuesday. A weak front is expected to bring showers across the waters Tuesday evening into Wednesday. Expect high pressure to rebuild Wednesday night into Thursday, before a more organized system pushes through the region Friday into next weekend. The small craft advisory for the Strait of Juan de Fuca continues for this evening/tonight for west winds of 15 to 25 kt. Another push will be possible again Wednesday through Friday. Seas increasing to 3-6 feet tonight through Saturday, with possible increases to 6-8 feet next weekend with the weather. HPR && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory from 6 PM this evening to 2 AM PDT Tuesday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. && $$