548 FXUS66 KSEW 050350 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 850 PM PDT Fri Apr 4 2025 .UPDATE...Dry conditions into Saturday with upper ridging across the Pacific Northwest. High clouds at times tonight will likely limit any fog extent, although localized fog may develop mainly around Olympia. No forecast updates this evening. && .SYNOPSIS...High pressure will build into the region through the remainder of the week, allowing conditions to dry out and warm up. Wet and cooler conditions are on track to return towards the end of the weekend and continue through mid-week as troughing settles into the Pacific Northwest. && .SHORT TERM /TONIGHT THROUGH TUESDAY/...Dry and mild weather prevails moving into the weekend thanks to high pressure. Temperatures are in the 50s and lower 60s this afternoon with plenty of sun. High clouds will move in tonight and we should see warmer overnight lows (no more frost and low 30s like this morning). Saturday will be mild and in the 60s to lower 70s, with a mix of mid and high clouds aloft. The upper level ridge will shift east on Sunday while a trough digs offshore. Rain with a cold front will reach the coast during the morning with rain spreading inland during the late morning and afternoon. Snow levels remain high for mostly rain in the mountains and passes. Showery weather extends into Monday with a trough overhead. The air mass will be cooler with snow levels lowering from around 5500 to 3500 ft. Snow amounts are highest over the volcanoes with just an inch or less at the Cascade passes. 33 .LONG TERM /WEDNESDAY THROUGH SATURDAY/...Washington remains under moist, W to SW flow, moving through next week, with additional rounds of rain and mountain snow. Temperatures will track close to average with lows in the 40s and highs in the mid to upper 50s. The coast may see over an inch of rain through the period, where 72-hour rain total probabilities are over 90 percent. Heavy rainfall in the Olympics may also force sharp rises on the Skokomish River in Mason County - near minor flood stage. 33 && .AVIATION...Northerly winds aloft becoming westerly tonight as an upper level ridge moves across western Washington. VFR conditions will prevail through the TAF period. Increasing mid-to-high level clouds early Saturday morning look to persist through much of the day. Localized patchy fog is possible near OLM overnight. Overall, winds look to continue to remain light and variable to calm overnight (generally southeasterly. The exception being at HQM, where offshore flow will be enhanced a bit by terrain. Surface flow will shift southwesterly Saturday morning, with speeds around 4-7 kt and higher speeds around HQM. KSEA...VFR conditions prevail through the TAF period. Increasing mid- to-high level clouds early Saturday morning. Winds light and variable to calm into the overnight hours (5 kt or less) and generally southeasterly. Winds will shift southwesterly late Saturday morning (4-6 kt). 62/29 && .MARINE...Broad high pressure over the northeast Pacific will remain in place through Sunday, continuing the period of light winds and seas. The next frontal system will move through the waters on Sunday, bringing a quick round of breezy winds which may require headlines. Additional systems look to traverse the area waters early next week, keeping breezy conditions in the forecast, in particular, on Monday night into Tuesday. Combined seas 2 to 4 feet through the remainder of today and early Saturday. Seas will start to gradually build upwards Saturday night into Sunday, reaching 10 to 13 feet Sunday and remaining in the 8 to 12 ft range through early next week. 62 && .HYDROLOGY...Periods of heavy rain next week will force sharp rises on the Skokomish River in Mason County and the river will be close to minor flood stage. River flooding is not expected elsewhere. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...None. && $$