San Juan Islands and Northern Inland Waters Marine Forecast
| Today...Ne Wind Around 5 Kt, Veering To E Around 5 Kt This Afternoon. Waves Around 2 Ft Or Less. A Chance Of Rain. |
| Tonight...E Wind Around 5 Kt, Backing To N After Midnight. Waves Around 2 Ft Or Less. A Chance Of Rain After Midnight. |
| Tue...E Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain. |
| Tue Night...E Wind 10 To 15 Kt, Rising To 15 To 20 Kt After Midnight. Waves Around 2 Ft Or Less. Rain. |
| Wed...E Wind 20 To 25 Kt, Becoming Se 15 To 20 Kt In The Afternoon. Waves Around 2 Ft Or Less, Then Around 3 Ft In The Afternoon. Rain. |
| Wed Night...Se Wind 20 To 25 Kt, Becoming S 15 To 20 Kt After Midnight. Waves Around 2 Ft Or Less. Rain. |
| Thu...Se Wind 20 To 25 Kt. Waves 3 To 4 Ft. Rain. |
| Thu Night...Se Wind 25 To 30 Kt, Veering To S 20 To 25 Kt After Midnight. Waves 3 To 4 Ft. Rain. |
| Fri...S Wind 15 To 20 Kt, Becoming Sw 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less. Rain. |
| Fri Night...S Wind 5 To 10 Kt, Backing To Se After Midnight. Waves Around 2 Ft Or Less. Rain, Mainly In The Evening. |
| Area Forecast Discussion National Weather Service Seattle WA 909am PST Monday Nov 3 2025 Synopsis Weak weather system lifting north into Southwest Washington today. The system will continue to drift north tonight before moving off to the east Tuesday morning. Warm front also moving in from the south Tuesday night with the trailing cold front stalling over the area Wednesday. Strongest system in this series moving inland Thursday into Friday morning. Possible break Saturday before another front arrives at the end of the weekend. Short Term - Today through Wednesday Weak front moving into Northwest Oregon/Southwestern Washington later today. Clouds thickening this morning with rain chances spreading north during the day. Operational runs not showing much in the way of rain from about Seattle northward. Ensembles show a different story with a high percentage of the solutions wet up to Everett. This will not be a big rain maker but will still have likely to categorical probability of precipitation from Seattle south this afternoon for a tenth of an inch or less. Cloud cover and increasing rain will not allow for much daytime heating. Highs only a couple of degrees either side of 50. Front continuing to lift a little north and east tonight. Rain chances getting as far north as Skagit county with likely pops from about Seattle southward. Cloud cover overnight will keep lows in the 40s with the exception of the north coast where some clearing will allow temperatures to drop into the mid and upper 30s. System kicking out to the east Tuesday morning with a very temporary upper level ridge building in the afternoon. Middle and high level clouds out ahead of an approaching warm front will keep skies mostly cloudy Tuesday afternoon. A little warmer with highs in the mid 50s. Not much of a break in the action Tuesday night as a warm front lifts north into Western Washington spreading rain over the entire area by midnight. Some cooler air trapped over the North Cascades keeping snow levels around 5000 feet while the remainder of the mountains see snow levels rise to 6500 to 7500 feet. The warm front will be a quick mover. This combined with the associated southerly flow aloft will not produce much rain for the Cascades, a half inch or less. The south slopes of the Olympics will be the wettest location in this scenario but even there rainfall amounts forecasted to be under an inch. Lows in the upper 40s. Trailing cold front slowly moving into Western Washington Wednesday. Like we have already seen a few times the last couple of weeks, the jet is aimed at Northern California and a deep upper level trough will be digging south behind the front. Both these variables will slow the eastward movement of the system down with the front stalling over Western Washington. The parent low for the front is way up in the Gulf of Alaska but windy conditions likely over the Northwest Interior and along the coast as the surface gradients tighten up with the approach of the front. Wind advisories possible in both locations Wednesday and maybe as early as Tuesday night. Highs in the mid to upper Long Term - Wednesday Night Through Sunday Models in good agreement with the cold front dying over Western Washington Wednesday night. Next system moving quickly into Western Washington Thursday being pushed by a 100-120 knot jet stream. Model forecasted IVT values around 500 kg/m/sec putting this in the weak atmospheric river category. Model 850 mb winds southwesterly 35-45 knots later Thursday into Thursday night enhancing the precipitation over the south slopes of the Olympics as well as the Central Cascades. Snow levels not extremely high, in the 5500 to 7000 foot range. Flood threat increasing for the Skokomish River ( see hydro section for details ). In addition to the rain another round of wind for the usual locations, Coast and Northwest Interior. Frontal system pretty progressive with the front east of the area by Friday afternoon or Friday evening. Operational models throwing an upper level ridge up for the weekend as another frontal system with a digging trough behind it develops well offshore. Ensembles solutions favoring a dry forecast at least for Saturday into Sunday afternoon but there are still 20-40% of the ensemble solutions indicating light precipitation both days. Will go with a chance of showers at this point for most of the weekend with the rain out ahead of the next frontal system Marine A surface low moving northeastward off the Oregon coast will dissipate as it moves onshore over northwest Oregon late today. A broad and deep area of low pressure will move into the offshore waters on Tuesday evening. A vigorous frontal system associated with a sub 980 millibar surface low lifting northward toward Haida Gwaii is expected to produce headlines for all waters Tuesday night through Wednesday night. Gales are likely for the coastal waters as well as the Strait of Juan de Fuca and adjacent waters during this period. A series of additional fronts will follow into the end of the week maintaining a very active weather pattern. Seas of 10 to 12 feet will gradually subside below 10 feet briefly tonight or early Tuesday before building back to 15 to 20 feet Wednesday through the rest of the week. 27 Hydrology A series of storm systems will move through Western Washington this week. The system Thursday into Friday will be the wettest one of the bunch. Flooding is likely on the Skokomish river in Mason county as early as Thursday night. The remainder of the rivers will have sharp rises late in the week but only the rivers flowing off the Central Cascades (Snoqualmie, Skykomish and Snohomish) are forecast to reach action stage. Most rivers will crest Friday and then recede over the weekend. The accumulation of rainfall over the next few days will NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory until 10am PST this morning for Grays Harbor Bar Small Craft Advisory until 10pm PST this evening 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. |
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