154 FXUS66 KSEW 221509 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 809 AM PDT Tue Apr 22 2025 .SYNOPSIS...Dry and warming conditions are expected through Thursday as high pressure moves into the region. Cooler conditions and precipitation chances will return to the forecast Friday into the weekend. && .UPDATE...A few areas of patchy fog will burn off quickly this morning. Otherwise a pleasant day is on tap across western Washington. The current forecast is on track and no updates are planned this morning. -Wolcott- && .SHORT TERM /TODAY THROUGH THURSDAY/...Cloud cover will continue to decrease early this morning as a dry shortwave trough digs southward into the Pacific Northwest and high pressure builds offshore. Clearing skies will allow temperatures to dip into the 30s for most areas this morning with patches of fog and frost possible, especially for areas south of the Puget Sound. A ridge of high pressure will move inland later today through Thursday, bringing in a gradual warming trend alongside dry and sunny conditions. Temperatures will rise to well above normal by Thursday, with most lowland areas east and south of the Puget Sound seeing highs in the 70s. Clouds will slowly start to move back into the region later on Thursday as a trough slowly approaches the coast and the upper ridge axis shifts to the east of the Cascades. .LONG TERM /FRIDAY THROUGH MONDAY/...A cutoff low is on track to move inland over northern California on Friday, advecting moisture northward towards western Washington. Precipitation will be highly dependent on the track of the low pressure system, with ensembles maintaining a chance of showers across the area on Friday. Chances for light precipitation alongside cooler temperatures continue through the weekend, with ensembles maintaining troughing over the region through Sunday. Ridging is favored to return by early next week, although forecast models show differences over the timing and strength of the next incoming system to start off next week. 15 && .AVIATION...Upper ridging centered offshore will continue to build into the region today with north to northwest flow aloft. The low level flow is northerly. Apart from patchy stratus across north Puget Sound and outlying river valleys this morning, VFR conditions will prevail areawide today. KSEA...VFR. Surface winds light and variable early becoming northerly 8 to 11 knots midday then shifting light northeasterly tonight. 27 && .MARINE...A broad surface ridge centered offshore will gradually weaken into Thursday. A weak trough moving into the Oregon offshore waters late in the week will increase northwesterlies over the coastal waters, but will otherwise produce little impact across area waters. 27 && .HYDROLOGY...No river flooding is expected over the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...None. && $$
NWS SEW Office Area Forecast Discussion
