James Island to Point Grenville WA out 10 NM Marine Forecast
| Today...S Wind 20 To 25 Kt, Rising To 30 To 35 Kt In The Afternoon. Seas 10 To 13 Ft, Building To 12 To 16 Ft This Afternoon. Wave Detail: S 6 Ft At 8 Seconds, Nw 3 Ft At 11 Seconds And Sw 15 Ft At 12 Seconds. A Slight Chance Of Tstms. |
| Tonight...Sw Wind 30 To 40 Kt, Veering To W After Midnight. Seas 14 To 19 Ft, Building To 18 To 23 Ft After Midnight. Wave Detail: W 22 Ft At 12 Seconds. Patchy Fog In The Evening. Showers. |
| Wed...W Wind 25 To 35 Kt, Becoming Sw 15 To 20 Kt In The Afternoon. Seas 16 To 21 Ft, Subsiding To 12 To 15 Ft In The Afternoon. Wave Detail: W 21 Ft At 12 Seconds. Showers In The Morning, Then Rain In The Afternoon. |
| Wed Night...Sw Wind 15 To 20 Kt, Becoming S 20 To 25 Kt After Midnight. Seas 10 To 12 Ft. Wave Detail: S 2 Ft At 4 Seconds, S 7 Ft At 7 Seconds And W 12 Ft At 12 Seconds. Rain. |
| Thu...Se Wind 25 To 30 Kt, Veering To Sw 20 To 25 Kt In The Afternoon. Seas 10 To 13 Ft. Wave Detail: S 10 Ft At 9 Seconds And W 12 Ft At 11 Seconds. Rain. |
| Thu Night...W Wind 15 To 20 Kt, Easing To 10 To 15 Kt After Midnight. Seas 10 To 13 Ft. Wave Detail: S 2 Ft At 10 Seconds, Sw 12 Ft At 11 Seconds And W 8 Ft At 11 Seconds. Rain. |
| Fri...W Wind 10 To 15 Kt. Seas 8 To 11 Ft. Wave Detail: S 3 Ft At 10 Seconds, W 8 Ft At 11 Seconds And Sw 8 Ft At 11 Seconds. Rain. |
| Fri Night...Sw Wind 15 To 20 Kt. Seas 8 To 10 Ft. Wave Detail: S 2 Ft At 9 Seconds, Sw 7 Ft At 10 Seconds And W 8 Ft At 11 Seconds. Rain. |
| Sat...Sw Wind 15 To 20 Kt, Easing To 10 To 15 Kt In The Afternoon. Seas 7 To 9 Ft. Wave Detail: W 7 Ft At 10 Seconds And Sw 7 Ft At 10 Seconds. Rain. |
| Sat Night...Sw Wind Around 10 Kt, Backing To S After Midnight. Seas 5 To 8 Ft. Wave Detail: W 6 Ft At 10 Seconds And Sw 5 Ft At 10 Seconds. Rain. Winds And Seas Higher In And Near Tstms. |
| Area Forecast Discussion National Weather Service Seattle WA 358am PST Tuesday Dec 16 2025 Synopsis A period of very active weather will dominate the week ahead as a series of frontal systems produce cascading impacts across Western Washington. In addition to ongoing river flood concerns, another period of windy conditions is expected tonight into early Wednesday. Snow levels will tumble to the passes by early Wednesday with heavy snowfall expected in the mountains. Cool, unsettled conditions will remain in place through the remainder of the week with substantial additional snowfall in the mountains. Short Term - Today through Thursday After a brief lull between systems early today, a secondary stronger system arrives tonight. Wind potential with it remains a concern. When combined with saturated soils already in place, the threat of fallen trees increases. Models show a sharp surface mesolow forming to the lee of the Olympics by 09Z Wednesday. This creates a very strong pressure gradient Seattle southward. Isallobaric analysis shows impressively strong pressure rises behind it...as much as 7 to 10 millibars in just three hours early Wednesday morning. So, it's not just wind speeds alone, but the rapid manner in which they could arrive. A very strong westerly surge will occur through the Strait of Juan de Fuca. In the period between around 11pm tonight and 6am Wednesday, gusts of 40 to 50 mph are expected for portions of the the interior lowlands with 50 to 60 mph along the coast, strait, and around Hood Canal. Snow levels will tumble to the passes by early Wednesday with significant snowfall expected. Totals could approach 10+ inches at Snoqualmie Pass by Wednesday afternoon, 18 to 24 inches at Stevens, and 2 to 3 feet at Mount Baker/Rainier. The snowfall will be accompanied by strong winds as well. A combination of post-frontal convergence and upslope flow will keep the snow piling up in the Cascades into Wednesday night. Quick on the heels of that system, another arrives on Thursday for additional lowland rain, breezy winds, and impactful mountain snowfall. Long Term - Thursday Night Through Monday There is no significant change in thinking for the extended portion of the forecast. A parade of systems will arrive nearly daily with additional lowland rain and mountain snow. Snow levels will remain near or below the passes through the period with significant additional accumulations. 27 Marine Frontal system moving into Western Washington late tonight into early Wednesday morning. Gale force winds developing ahead of the front over the coastal waters. Sharp pressure rises behind the front will produce a round of strong winds over all the waters. Gale warnings are in effect for all the waters tonight with storm warnings up for the Central and Eastern Strait of Juan de Fuca for a few hour window in the early morning hours Wednesday. Winds easing later Wednesday morning into Wednesday afternoon with small craft advisory winds continuing over the coastal waters and in the Strait of Juan de Fuca. Another system arriving Thursday will keep small craft advisory winds going over the coastal waters. Seas in the 10 to 14 foot range today building to 18 to 24 feet tonight into Wednesday. Seas subsiding back down to 10 to 14 feet Wednesday night into Thursday. Seas remain just above 10 feet Thursday night falling back into single digits Friday. Hydrology Another frontal system will bring one to three inches of precipitation to the mountains through Wednesday with an inch or less in the lowlands. Cooler air moving into the area later tonight adds some uncertainty to the forecast river levels with snow levels dropping to 2000 to 2500 feet Wednesday morning. The front tonight has more moisture than the system Monday but the cooler air will keep some of the moisture in the mountains in the form of snow. This combination makes for tricky river forecasting. Major flooding is possible on the Skagit river beginning Wednesday morning in the upper reaches with the flood crest reaching Mount Vernon Thursday morning. Moderate flooding is forecast for the rivers flowing out of the Central Cascades like the Skykomish, Snoqualmie and Snohomish. Could also see some moderate flooding on the Cowlitz river. Most of the remainder of the river forecast to reach flood stage will experience minor flooding. A flood watch is in effect through Thursday afternoon across the lowlands. The landslide threat remains very elevated will continue to be NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Wind Advisory from 7pm this evening to 6am PST Wednesday for City of Seattle-Eastside-Foothills and Valleys of Central King County-Foothills and Valleys of Pierce and Southern King Counties-Foothills and Valleys of Snohomish and Northern King Counties-Foothills and Valleys of the North Cascades-Lowlands of Western Whatcom County-San Juan County-Shoreline / Lynnwood / South Everett Area. Flood Watch through Thursday afternoon for Cascades of Pierce and Lewis Counties-Cascades of Snohomish and Northern King Counties-Cascades of Southern King County-Cascades of Whatcom and Skagit Counties-City of Seattle-Downtown Everett / Marysville Area-Eastside-Foothills and Valleys of Central King County-Foothills and Valleys of Pierce and Southern King Counties-Foothills and Valleys of Snohomish and Northern King Counties-Foothills and Valleys of Thurston and Lewis Counties-Foothills and Valleys of the North Cascades-Foothills of the Western and Southern Olympic Peninsula-Grays Harbor County Coast- Lower Chehalis River Valley-Lowlands of Lewis and Southern Thurston Counties-Lowlands of Pierce and Southern King Counties-Lowlands of Western Skagit and Northwestern Snohomish Counties-Lowlands of Western Whatcom County-Middle Chehalis River Valley-Olympia and Southern Puget Sound-Olympics-Shoreline / Lynnwood / South Everett Area-Willapa and Black Hills. Winter Storm Warning from 4pm this afternoon to 10pm PST Wednesday for Cascades of Pierce and Lewis Counties- Cascades of Snohomish and Northern King Counties-Cascades of Southern King County-Cascades of Whatcom and Skagit Counties-Olympics. High Wind Warning from 7pm this evening to 6am PST Wednesday for Downtown Everett / Marysville Area-Eastern Strait of Juan de Fuca-Foothills of the Western and Southern Olympic Peninsula-Grays Harbor County Coast-Island County- Lake Crescent Area Including US 101-Lower Chehalis River Valley-Lowlands of Pierce and Southern King Counties- Lowlands of Western Skagit and Northwestern Snohomish Counties-Middle Chehalis River Valley-Northern Hood Canal- Northern Washington Coast-Olympia and Southern Puget Sound-Port Townsend Area-Southern Hood Canal-Western Strait of Juan de Fuca. PZ...Small Craft Advisory until 4pm PST Wednesday for Grays Harbor Bar Small Craft Advisory until noon PST today 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. Gale Warning from noon today to noon 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- West Entrance USA Waters Strait Of Juan De Fuca. Gale Warning from 4pm this afternoon to midnight PST tonight for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. Storm Warning from midnight tonight to 6am PST Wednesday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. Gale Warning from 6pm this evening to 6am PST Wednesday for Admiralty Inlet Northern Inland Waters Including The San Juan Islands- Puget Sound and Hood Canal |
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