Cape Flattery to Cape Shoalwater WA between 60 and 150 NM Offshore Forecast
| Tonight...S To Sw Winds 10 To 20 Kt, Becoming Sw 5 To 15 Kt Early, Then, Becoming S To Se 10 To 20 Kt. Seas 13 To 19 Ft. Rain. |
| Sat...Sw Winds 25 To 35 Kt, Becoming W 15 To 20 Kt. Seas 16 To 18 Ft. Rain. |
| Sat Night...W Winds 10 To 20 Kt. Seas 15 To 17 Ft. |
| Sun...W Winds 10 To 20 Kt, Becoming Sw 5 To 15 Kt. Seas 14 To 17 Ft. |
| Sun Night...S To Sw Winds 5 To 15 Kt, Becoming E To Ne 10 To 20 Kt. Seas 13 To 16 Ft. |
| Mon...E To Ne Winds 10 To 20 Kt. Seas 10 To 13 Ft. |
| Mon Night...N To Ne Winds 15 To 25 Kt, Becoming W To Nw 10 To 20 Kt. Seas 8 To 12 Ft. |
| Tue...Se Winds 5 To 15 Kt, Increasing To 20 To 30 Kt. Seas 8 To 11 Ft. |
| Tue Night...Se Winds 25 To 35 Kt. Seas 9 To 16 Ft. |
| Wed...S To Se Winds 20 To 30 Kt. Seas 14 To 16 Ft. |
| Wed Night...Sw Winds 15 To 25 Kt. Seas 14 To 16 Ft. |
| Area Forecast Discussion National Weather Service Seattle WA 435pm PDT Fri Oct 31 2025 Synopsis An atmospheric river moving into the area tonight into Saturday will bring moderate to heavy rain and gusty winds to western Washington. Precipitation will taper across the area on Sunday. Additional, weaker systems will move through the region early next week bringing unsettled conditions to area. Stronger systems look to impact the region mid to late week for additional rounds of rain and winds. Short Term - Tonight Through Sunday Night An atmospheric river moving into the region will bring gusty winds and periods of moderate to heavy rain to western Washington tonight into Saturday. Radar this afternoon shows moderate to heavy stratiform rain making its way inland. Stratiform rain will continue to push into the interior this evening. A front will stall over the area tonight and another strengthening low pressure system will move across the area on Saturday. The track of this system has brought increased precipitation amounts and winds to the area for Saturday. Details on the precipitation, wind, and high surf hazards are outlined below, while details on the potential for river flooding can be found under the hydrology section: Rain: Moderate to heavy rain will continue to sag southward through the evening and overnight hours. A strengthening low moving into the area on Saturday may help enhance precipitation totals, though most likely amounts of rain still remain in the 2-4 inch ballpark along the coast, Olympics and North/Central Cascades. A few locally higher amounts to 5 inches will be possible in the mountains. Areas across the interior lowlands will likely see anywhere from 1-2 inches, with more rain shadowed locations like Admiralty Inlet resulting in slightly less rainfall. A convergence zone will develop Saturday afternoon and evening around King/Snohomish counties as strong onshore flow follows the front. Will need to monitor the set up and convective nature of the PSCZ should it fall over Stevens Pass or any sensitive burn scars. Winds: Windy conditions will continue along the coast and for areas primarily north of Whidbey Island through tonight before easing late. There will be a brief lull in the winds heading into the overnight period, before southerly winds start to increase again areawide on Saturday morning. Latest REFS/HREF guidance indicates roughly a 30-60 percent chance of wind gusts exceeding 40 MPH for areas south of Skagit County. Wind advisories remain in effect for the strong winds tonight and additional advisories have been posted for much of the area for Saturday. Localized power outages and tree damage will be possible. High Surf: Large waves will build towards 16-20 ft along the coast on Saturday, with a period of around 15-17 seconds. Large waves may run further up area beaches and could cause localized beach erosion. Showers will taper into Sunday, becoming more confined to the Cascades through the day. A brief period of drier weather is expected on Sunday night. Long Term - Monday Through Friday Unsettled conditions look to continue into early next week as another weaker, progressive system moves into the area on Monday for another round of rain and breezy conditions. A brief break in the weather is possible on Tuesday as showers taper through the day, though active weather looks to return Wednesday into Thursday as guidance still hints at a stronger system moving into the area. Coastal flooding potential will also need to be monitored mid to late week as astronomical tides increase. 14 Marine A frontal system is moving across the area this evening with increased southerly winds. Gale Warnings remain in effect for the western/eastern Strait of Juan de Fuca, northern inland waters, Admiralty Inlet, as well as the coast. These products will be allowed to expire tonight, however more gales have been issued for tomorrow due to a shift in the expected storm's track. These will go into effect Saturday morning for the central/southern coastal waters and the west/east strait along with strong winds clipping parts of the Northern Inland waters and Puget Sound. Widespread moderate to heavy rainfall may also result in a reduction to visibilities at times through today. Another weather system late Monday into Tuesday will increase winds again. The active pattern then continues midweek with another weather system with the potential for more headlines. Seas 10 to 15 feet this evening, before building further towards 16 to 20 feet late tonight through Saturday. The dominant period will remain 15 to 17 seconds early Saturday as well. Seas will slowly subside towards 10 feet by Monday, but are expected to build again by midweek. McMillian Hydrology Rain associated with an atmospheric river has begun along the coast and is currently moving through the interior. Rain will continue through most of Saturday. Snow levels rising to 8000 to 9000 feet today will remain high tonight and Saturday before lowering to around 4000 feet Saturday night behind the system. Forecast IVT values spike tonight into Saturday morning around 750-1000 kg/m/sec which corresponds to a moderate atmospheric river. IVT values will lower later on Saturday. Forecast Quantitative Precipitation Forecast has increased this afternoon, especially in the North and Central Cascades. Quantitative Precipitation Forecast totals for the 24 to 36 hour event have increased to an 3 to 5 inch range over the Olympics and the Cascades between Skagit and King counties, with locally higher amounts possible especially in the North and Central Cascades. Therefore, A Flood Watch has been issued for Mason, King, Snohomish, Skagit, and Whatcom counties. The main rivers flowing off the Northern and Central Cascades including but not limited to the Snoqualmie, Skykomish, Snohomish and Skagit could reach action stage later Saturday into Saturday night. Given the high snow levels it will not take much increase in the rain totals to increase the flood threat especially on the Snoqualmie and Skykomish. Like previous events earlier in October this atmospheric river has the potential for brief relatively high rainfall rates. If these higher rainfall rates occur over the more sensitive burn scars there is the potential for flash flooding and or debris flows in those areas. High rainfall rates can also cause localized urban flooding in areas of poor/blocked drainage and small creeks and streams. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Wind Advisory until 10pm PDT this evening for Island County- Lowlands of Western Whatcom County-Port Townsend Area-San Juan County. Flood Watch from Saturday morning through late Saturday night for 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 the North Cascades-Foothills of the Western and Southern Olympic Peninsula-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- Southern Hood Canal-Willapa and Black Hills. Wind Advisory from 9am to 5pm PDT Saturday for City of Seattle-Downtown Everett / Marysville Area-Eastern Kitsap County-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- Lowlands of Pierce and Southern King Counties-Lowlands of Western Skagit and Northwestern Snohomish Counties- Northern Hood Canal-Shoreline / Lynnwood / South Everett Area-Southern Hood Canal. Wind Advisory from 9am to 2pm PDT Saturday for Foothills of the Western and Southern Olympic Peninsula-Grays Harbor County Coast-Lower Chehalis River Valley-Lowlands of Lewis and Southern Thurston Counties-Middle Chehalis River Valley-Northern Washington Coast-Olympia and Southern Puget Sound-Willapa and Black Hills. Wind Advisory from 10am to 8pm PDT Saturday for Island County-Port Townsend Area. Wind Advisory until 7pm PDT this evening for Northern Washington Coast. High Surf Advisory from 2am to 5pm PDT Saturday for Grays Harbor County Coast-Northern Washington Coast. PZ...Small Craft Advisory until 8pm PDT Saturday for Grays Harbor Bar Gale Warning until 7pm PDT this evening for West Entrance USA Waters Strait Of Juan De Fuca. Small Craft Advisory until 5pm PDT Saturday for West Entrance USA Waters Strait Of Juan De Fuca. Small Craft Advisory until 7pm PDT this evening for Central U.S. Waters Strait Of Juan De Fuca. Gale Warning from 2pm to 8pm PDT Saturday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. Gale Warning until 10pm PDT this evening for Admiralty Inlet East Entrance U.S. Waters Strait Of Juan De Fuca- Northern Inland Waters Including The San Juan Islands. Gale Warning from 9am to 4pm PDT Saturday for Northern Inland Waters Including The San Juan Islands- Puget Sound and Hood Canal Small Craft Advisory until midnight PDT tonight for Puget Sound and Hood Canal Gale Warning until 5pm PDT this afternoon 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. Small Craft Advisory until 9pm PDT Saturday for Coastal Waters From Cape Flattery To James Island 10 To 60 Nm- Coastal Waters From Cape Flattery To James Island Out 10 Nm. Gale Warning from 7am to 3pm PDT Saturday for 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. Small Craft Advisory until 7am PDT Saturday for 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. |
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