Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000 FXUS66 KSEW 092146 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 246 PM PDT Fri Jun 9 2023 .SYNOPSIS...
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Cool and showery conditions are expected across western Washington into the first half of Saturday. Dry conditions and temperatures warming to above normal through Monday. Conditions will gradually cool back toward normal through the end of next week.
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&& .SHORT TERM /TONIGHT THROUGH MONDAY/...
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Rain showers continue to spread northwest across western Washington this afternoon as a weak and broad upper level low slides north around a blocking ridge over central Canada. Impacts from this rain will largely be beneficial due to the recent dry conditions, though roads will be slick and we will continue to monitor the area burn scars for flood hazards. The area will be situated between a reinforcing trough along the California coast and the blocking ridge over south central Canada on Saturday before ridging over the eastern Pacific noses into the region Sunday and Monday. This evolution will result in precipitation gradually diminishing from southwest to northeast through the day on Saturday and then a quick warm up Sunday and Monday. Temperatures by Monday will reach back into the 80s again for much of the interior lowlands and are likely to bring back a few areas of Moderate/Orange HeatRisk. .LONG TERM /TUESDAY THROUGH FRIDAY/...The warm conditions Monday will be short-lived as a progressive shortwave moves overtop of the eastern Pacific ridge. Impacts from the wave will largely be felt north and east of the area with the main sensible weather effect for Washington being a weak and dry front resulting in a cooling trend through the remainder of the work week. Looking out a bit further, there are some hints of additional troughing late next week that could bring some cooler air and additional precipitation to the region. This is also reflected in the CPC 6-10 day outlook. -Wolcott-
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&& .AVIATION...
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Light flow aloft as an upper-low meanders across the region. Light onshore flow is also present in the lower levels. A mixed bag of VFR to MVFR/IFR is currently observed. For tonight, any lingering VFR cigs will transition to all MVFR/IFR into the early morning hours on Saturday. Isolated instances of low visibility are possible under heavier precipitation as showers persist overnight. Low stratus is in the forecast into Saturday as well but conditions should gradually improve late in the day as shower activity decreases. KSEA...MVFR ceilings are in the forecast tonight into Saturday morning. IFR cigs are also possible but of a much lesser chance (20- 25 percent). Shower activity is likely to persist during this time with some dry time in between. Southwest winds 3 to 8 knots through much of the upcoming TAF period. McMillian
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&& .MARINE...
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Surface high pressure over the northeast Pacific with lower pressure inland into the beginning of the week. The high will strengthen Sunday into Monday and possibly bring headline winds for the outer coastal waters. A weak upper level system will continue to bring rain and showers mostly to the inland waters through Saturday. An additional SCA has been issued this evening for westerly winds through the central section of Strait of Juan de Fuca. They appear to be borderline with gusts around advisory criteria being the main reason for the issuance. Winds are to decrease late overnight into early Saturday morning. Seas generally 2 to 4 feet tonight through Saturday before increasing to 6 to 8 feet Saturday night into Sunday and remain elevated through the beginning of next week. McMillian
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&& .HYDROLOGY...The daily hydrology discussion has ended until the start of the next rainy season; it will only be updated as needed. && .SEW WATCHES/WARNINGS/ADVISORIES...
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WA...None. PZ...Small Craft Advisory until 2 AM PDT Saturday for Central U.S. Waters Strait Of Juan De Fuca.
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&& $$

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