![National Oceanic and Atmospheric Administration](/build/images/header/noaa.d87e0251.png)
![National Weather Service](/build/images/header/nws.4e6585d8.png)
![United States Department of Commerce](/build/images/header/doc.b38ba91a.png)
Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA
Issued by NWS Seattle/Tacoma, WA
809 FXUS66 KSEW 110954 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 254 AM PDT Sun Aug 11 2024 .SYNOPSIS...Upper level troughing over the region will persist over the next several days, promoting onshore flow and cooler temperatures. Showers will be mainly over the Cascades with a chance of showers over the rest of western Washington over the weekend. && .SHORT TERM /TODAY THROUGH TUESDAY/...Troughing over the Pac NW will bring cloudier and cooler weather to western WA today through Tuesday. Expected high temperatures will be in the 60s to lower 70s with lows in the 50s. There is a slight chance of showers and thunderstorms during the afternoon and early evening hours in the North Cascades, especially near the crest. 33 .LONG TERM /WEDNESDAY THROUGH SATURDAY/...Troughing continues into the rest of the week and weekend as a low drops down from Canada. Temperatures will be a little warmer and closer to normal with highs in the mid to upper 70s. The coast will remain in the 60s with NW winds. Showers will be mostly over the Cascades Thursday and Friday, with showers expanding to the rest of western WA on Saturday as the upper low pulls in some moisture. 33 && .AVIATION...Northwest flow aloft with upper level troughing over the region. Marine stratus is building inland and becoming widespread yet again across western WA. Ceilings under the stratus are ranging between MVFR to LIFR, as well as isolated vis restrictions. Stratus will be slow to retreat this this afternoon for the interior with a gradual return to VFR conditions after 18- 21z. The coast, however, does not look to clear out today and will remain under low ceilings through the TAF period. Another widespread push of marine stratus is likely to redevelop overnight into Monday morning. Winds will remain west-southwesterly 5 to 10 kt throughout the TAF period. KSEA...IFR cigs have returned and look to remain that way for the most of the morning. Ceilings may rise a touch to low-end MVFR before improving to VFR the 21Z Sunday to 00z Monday window. Winds remain southwesterly 5 to 10 kt. McMillian && .MARINE...A broad 1032mb NE Pacific surface high is well offshore but is maintaining onshore flow here across area waters. SCA through the central/eastern strait continues but should be allowed to expire here this morning. The SCA for the outer coastal waters will persist well into the day due to steep seas of 6 to 9 ft along with a dominant period of 8 seconds. Seas will subside on Monday back to 3 to 5 ft and remain like so through the week. McMillian && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory until 4 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 PM PDT this afternoon 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. && $$