FXUS66 KSEW 031821 AFDSEW Area Forecast Discussion National Weather Service Seattle WA 1021 AM PST Tue Feb 3 2026 .SYNOPSIS... High pressure will build over the region Tuesday through the remainder of the week, bringing in unseasonably warm and dry conditions with rounds of morning fog and low stratus. A pattern change is on tap for the weekend, with wet and cooler conditions returning. && .SHORT TERM /TODAY THROUGH THURSDAY/... High pressure brings a period of dry and mild weather to western WA through the remainder of the work week. Expect highs in the mid to upper 50s with 60s in the interior on Wednesday. Lows will be a little cooler Thursday morning with 30s over the south sound. 33 && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... Wet and cooler weather returns over the weekend as the ridge shifts east and a trough moves in from the west. Snow levels will lower to around 4000 feet on Sunday with accumulating snow possible on the higher peaks and passes like Stevens Pass. Ensemble members favor a cool and wet pattern moving into next week for more lowland rain and mountain snow. 33 && .AVIATION... Light west to southwest flow aloft expected over Western Washington into tonight as an upper ridge axis builds over the interior West. The low level flow is weakly offshore. The ridge will remain rather dirty today with varying amounts of high and mid level moisture filtering across the area as a frontal system moves into the British Columbia coast late today. Patchy LIFR stratus/fog across the Southwest Interior will gradually lift and scatter this afternoon. High level moisture will begin to thin late tonight and, coupled with weak surface flow, is likely to lead to the return of LIFR/IFR stratus and fog on Wednesday morning from around KSEA/KBFI southward. KSEA...Varying amounts of high and mid level clouds will continue into tonight. As discussed above, the coupling of thinning high clouds and weak surface gradients lends moderate confidence to the return of fog and/or low clouds at the terminal again early Wednesday morning. Surface winds light and variable much of today trending more easterly tonight at 7 knots or less. 27 && .MARINE... A decaying system well offshore will bring seas back up to 10-12 feet later this evening into Wednesday. As a result, a SCA has been issued again for the outer coastal waters. SCA level winds are also possible around this time - but mainly for the outer coastal waters where a 40-45% chance exists. As high pressure builds into today through the remainder of the work week, expect periods of marine fog over the next few days. Visibility restrictions in Puget Sound and the coastal waters are possible as fog and/or low stratus develops. Seas 10-12 ft through Thursday morning, before setting around 9-10 ft thereafter. && .HYDROLOGY... The Skokomish River will fall below flood stage late this morning or early afternoon and will continue to recede. The river will rise again early next week and crest near minor flood stage again. Flooding is not expected elsewhere over the next 7 days. 33 && .SEW WATCHES/WARNINGS/ADVISORIES... WA...None. PZ...Small Craft Advisory from 4 PM this afternoon to 4 PM PST Wednesday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm-Coastal Waters From Cape Flattery To James Island Out 10 Nm-Coastal Waters From James Island To Point Grenville 10 To 60 Nm-Coastal Waters From James Island To Point Grenville Out 10 Nm-Coastal Waters From Point Grenville To Cape Shoalwater 10 To 60 Nm-Coastal Waters From Point Grenville To Cape Shoalwater Out 10 Nm. && $$