Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA
Issued by NWS Seattle/Tacoma, WA
339 FXUS66 KSEW 111011 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 211 AM PST Tue Nov 11 2025 .SYNOPSIS... Largely dry conditions are expected today as weak high pressure builds into the area. The next system is offshore and is expected to arrive in the area Wednesday afternoon into Thursday. The pattern looks to remain active through the late week into the weekend, with additional systems expected over the weekend. && .SHORT TERM /TODAY THROUGH THURSDAY/... Satellite imagery early this morning shows widespread low clouds throughout western Washington. Most of this is likely stratus, but some fog development may still be possible in areas such as Olympia and areas south of that. Cloud decks are generally 2000 feet or lower and will likely linger through much of the morning. High pressure aloft will keep conditions dry today, with highs in the mid 50s. Another system will arrive onshore early on Wednesday through Thursday for a round of light rain and some mountain snow. Winds will be lightly offshore on Wednesday, with breezy conditions at times along the immediate coast. Snow levels will be higher, 6000-7000 feet on Wednesday, but look to decrease Thursday afternoon to around 3800 feet, with mixed precipitation possible along the Cascade Passes and higher areas of the foothills. 21 && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... There is still some uncertainty late in the week about where the core of the parent low pressure system will arrive onshore, but the solutions seem to be converging somewhere along the Oregon coast. Precipitation is forecast to continue into Thursday night and Friday. None of these systems seem particularly impressive as it relates to QPF, as storm total QPF from Wednesday morning through Friday afternoon details around a half to three quarters of an inch of rain throughout Puget Sound, and one to two inches of rain in the Olympic and Cascade mountains. Snow levels come down to around 3800 feet Thursday night into Friday morning for some snow accumulation more likely at Stevens Pass than Snoqualmie pass at this point. An additional system over the weekend may be slightly wetter and bring another round of snow accumulation in the mountains. 21 && .AVIATION... Weak high pressure over the region today for dry weather. The flow aloft is westerly. Lots of low level moisture across western WA with IFR to MVFR conditions this morning. VFR conditions expected by the afternoon. Rain spreading inland Wednesday morning as a trough moves in from the west. 33 KSEA...MVFR conditions this morning with light wind. VFR conditions expected by 21Z with N winds around 5 kt. 33 && .MARINE... High pressure over the area today for generally light winds. Next frontal system moving slowly through the waters Wednesday night and Thursday with increasing southerly winds over the waters. Strong onshore flow will follow Thursday night. Meanwhile, seas will also build to around 10 to 13 feet. Additional fronts will reach the area Friday and over the weekend, keeping the pattern active. 33 && .HYDROLOGY... High pressure will bring a brief break in precipitation on Tuesday before chances for heavier precipitation increase towards the end of the week. While the second half of the week will be wetter, the systems look to remain rather progressive across the region. At this time, no river flooding is expected over the next 7 days. && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...None. && $$