Cape Flattery to Cape Shoalwater WA between 60 and 150 NM Offshore Forecast
| Tonight...S Winds Less Than 10 Kt, Increasing To 5 To 15 Kt. Seas 11 To 15 Ft. |
| Fri...S To Sw Winds 10 To 20 Kt, Becoming Sw 10 To 15 Kt. Seas 10 To 12 Ft. |
| Fri Night...Sw Winds 5 To 10 Kt, Increasing To 10 To 15 Kt. Seas 10 To 15 Ft. |
| Sat...Sw Winds 10 To 15 Kt, Becoming S To Sw 10 To 20 Kt. Seas 12 To 14 Ft. |
| Sat Night...S Winds 15 To 25 Kt. Seas 11 To 13 Ft. |
| Sun...N To Nw Winds 10 To 20 Kt. Seas 11 To 13 Ft. |
| Sun Night...W To Nw Winds 15 To 20 Kt. Seas 9 To 11 Ft. |
| Mon...Nw Winds 15 To 20 Kt, Diminishing To 5 To 15 Kt. Seas 8 To 10 Ft. |
| Mon Night...W To Nw Winds 5 To 10 Kt, Becoming S. Seas 7 To 9 Ft. |
| Tue...S Winds 5 To 15 Kt, Increasing To 10 To 20 Kt. Seas 7 To 9 Ft. |
| Tue Night...S Winds 10 To 20 Kt, Increasing To 20 To 30 Kt. Seas 6 To 10 Ft. |
| Area Forecast Discussion National Weather Service Seattle WA 329pm PST Thu Nov 20 2025 Synopsis Drier weather through Friday morning as ridging nudges into Western Washington. A stalled frontal system will be located over British Columbia late Friday through Saturday. A cold front will bring rain and higher elevation mountain snowfall on Sunday. Cooler weather expected on Monday. Another potential system may bring rain, mountain snow midweek. Short Term - Tonight Through Saturday Night Generally dry conditions this afternoon with a few lingering showers over the Olympic Peninsula. Weak ridging will build into Western Washington briefly into Friday morning for dry conditions tonight. Some clearing, along with light winds, may promote fog development, especially for the southern Puget Sound. Temperatures tonight will cool into the mid 30s to low 40s, with temperatures nearing freezing south of Olympia. The aforementioned ridge will flatten for more westerly flow aloft late Friday through Saturday as a frontal system stalls over British Columbia. This will bring rain at times for the northern Olympic Peninsula, as well as north interior (mainly north of Snohomish County) Friday night through Saturday. Conditions are expected to remain mainly dry south of Everett on Saturday. South winds will also increase on Saturday, mainly along the north coast and Whidbey Island northwards, with localized gusts in these areas between 20 to 35 MPH. Temperatures will be a few degrees warmer than normal on Saturday in the mid 50s. Long Term - Sunday Through Thursday The aforementioned weather system over British Columbia will move through Western Washington late Saturday through Sunday. Steadier rain is expected on Sunday for the lowlands, as well as breezy winds, with gusts ranging 20 to 35 MPH for most areas (locally higher around Whidbey Island). Snow levels initially around 5500 feet on Sunday will lower to 2500 feet by Sunday night. Snow will increase for the Cascades during this period, with accumulating snowfall expected for Snoqualmie and Stevens Pass Sunday night into Monday. At this time, current snowfall forecast range 4 to 6 inches for the Passes, but a developing convergence zone Sunday night may bring locally higher amounts in the vicinity of the central Cascades. Precipitation slowly tapers off for the Cascades on Monday. Ensembles suggest a brief break in the precipitation Monday night into early Tuesday with cooler temperatures. Heading into midweek, there is indications in ensembles of a moisture plume focused towards the Pacific Northwest. Variability remains in individual ensemble members in the orientation of any potential AR, thus uncertainty remains in Quantitative Precipitation Forecast amounts and locations. Looking at the Cluster Analysis for a 48 period ending 12z Thursday, the multi-model ensemble mean (GEFS, EPS, GEPS) has Quantitative Precipitation Forecast amounts ranging 1-3" for the Olympics and Cascades. Individual clusters show fluctuation in Quantitative Precipitation Forecast amounts, with 55% of the ensemble members showing over 3" of precipitation for portions of the Cascades. Snow levels also remain uncertain by midweek, but will also need to monitor the potential for snow over the higher elevation Cascade Passes. If you're traveling next week, continue to monitor the forecasts. JD Marine Large waves will continue building over the coastal waters, western Strait, and Grays Harbor bar , peaking this afternoon at 13-17 ft. A Small Craft Advisory remains in effect for these areas. Waves will gradually decrease overnight into Friday, but will hover around 9-11 ft. A weather system will traverse area waters this weekend, bringing the potential for small craft winds to area waters. Latest guidance suggests the central Strait has the highest chance (30-45%) of sustained speeds meeting criteria Sunday afternoon/evening into early Monday morning. There is also the potential for gale gusts along the central Strait, with latest guidance at 25-35%. 29 Hydrology A weather system will move across Western Washington late Saturday into Monday for lowland rain and mountain snowfall. No river flooding is expected during this period, but rivers will rise. The potential exists for additional, heavier precipitation during the middle of next week. However, uncertainty exists in both the location and duration of precipitation. River levels will continue to be monitored during this mid to late week period. JD NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory until noon PST Friday for Grays Harbor Bar Small Craft Advisory until 4am PST Friday 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- West Entrance USA Waters Strait Of Juan De Fuca. |
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