San Juan Islands and Northern Inland Waters Marine Forecast
| Rest Of Today...S Wind 15 To 20 Kt, Easing To 5 To 10 Kt. Waves Around 3 Ft Late This Morning, Then Around 2 Ft Or Less. Patchy Fog Late This Morning. Rain Late This Morning, Then Rain With A Slight Chance Of Tstms This Afternoon. |
| Tonight...Se Wind 5 To 10 Kt, Rising To 15 To 20 Kt After Midnight. Waves Around 2 Ft Or Less. Showers Likely In The Evening, Then A Chance Of Rain After Midnight. |
| Tue...Se Wind 15 To 20 Kt. Waves Around 2 Ft Or Less, Then Around 3 Ft In The Afternoon. Rain. |
| Tue Night...Se Wind 20 To 25 Kt With Gusts Up To 40 Kt. Waves 3 To 4 Ft. Rain. |
| Wed...Se Wind 20 To 25 Kt. Gusts Up To 35 Kt In The Morning. Waves 3 To 4 Ft. Rain. |
| Wed Night...Se Wind 20 To 25 Kt. Gusts Up To 35 Kt After Midnight. Waves 3 To 4 Ft. Showers In The Evening, Then Rain After Midnight. |
| Thu...Se Wind 20 To 25 Kt, Easing To 15 To 20 Kt In The Afternoon. Waves Around 3 Ft In The Morning, Then Around 2 Ft Or Less. Rain. |
| Thu Night...S Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. Waves Around 2 Ft Or Less. Rain Likely, Mainly In The Evening. |
| Fri...S Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain. |
| Fri Night...S Wind 5 To 10 Kt, Veering To Sw After Midnight. Waves Around 2 Ft Or Less. Rain Likely. Winds And Waves Higher In And Near Tstms. |
| Area Forecast Discussion National Weather Service Seattle WA 905am PDT Monday September 29 2025 Synopsis A frontal system will push through Western Washington today. A stronger frontal system is expected Tuesday through Wednesday. These systems will bring widespread rain, breezy to gusty winds, and a slight chance of thunder. Unsettled conditions are favored to continue late into the week as additional systems move into the region. Short Term - Today through Wednesday The main band of precipitation associated with a splitting frontal system continues to progress eastward across Western Washington this morning. Quantitative Precipitation Forecast will remain relatively light with this system, but this sets the stage for a 120 knot jet max offshore to direct a stronger system into the region tomorrow into Wednesday. The main impacts will be gusty winds (especially coast and North Interior) and locally heavy precipitation over the Olympics. Current forecasts are on track. 27 A frontal system continues to push across Western Washington early this morning. Latest satellite imagery as of 350am shows light to moderate rain making its way along the coast and a few light showers moving across the interior locations. This weather system will bring breezy to gusty winds to the coast, locations along the east Strait, and northern interior Monday morning. There is high confidence (80- 90% chance) of seeing wind gusts exceed 25 mph for the east Strait and Whidbey Island, while there is medium to high confidence (50-80% chance) for the northern interior. There is medium confidence (40- 65% chance) of seeing wind gusts exceed 35 mph for locations along the east Strait and Whidbey Island. There is a slight chance (10- 25%) of thunder this afternoon, with the highest chances along the Olympic Peninsula and Cascades. Rainfall totals with this system will range between 0.10-0.50 inches in the interior, 1.00-2.00 inches for the Olympics and Cascades, and 0.50-1.00 inches along the coast. A stronger frontal system associated with an upper level low offshore will move through Western Washington Tuesday through Wednesday. This system will bring more rain than the last system. WPC has included the Olympic Peninsula under a marginal risk for their Excessive Rainfall Outlook, indicating at least a 5% risk for significant rainfall. Latest guidance suggests, the Olympic Peninsula may see between 2.00-4.00 inches of rain, with higher amounts in the mountain peaks. As for other locations, 0.25-1.00 inches in the interior and 1.00-3.00 inches in the Cascades. In addition, this system will bring breezy to gusty winds and the chance for thunder. There is high confidence of seeing wind gusts exceed 25 mph along the coast, east Strait, Whidbey Island, and northern interior. Stronger winds will be along the coast, east Strait, and Whidbey Island, where there is medium confidence (40-60% chance) of seeing gusts exceed 35 mph. Latest model runs have trended higher on the chance of thunder for Tuesday and Wednesday. On Tuesday thunder chances (20-30%) will be mostly confined to the coast, with a smaller chance (10-15%) in the interior. On Wednesday evening , thunder chances are slightly higher; guidance suggests a 20-40% chance for the Olympic Peninsula and a 15-20% chance for other locations. Wave heigheights along the coast will approach 15 feet or higher on Wednesday. This may generate hazardous surf conditions with waves running higher on beaches that can sweep people off jetties and breakwaters. Beach erosion is also possible. Long Term - Thursday Through Sunday Latest deterministic models and ensemble data are coming to a general agreement that the center of upper level low offshore will move through Western Washington on Thursday. This will keep unsettled conditions late into the week. However, uncertainty still remains over the weekend on the upper level pattern. Latest ensemble guidance shows zonal flow is likely behind the upper level low on Friday with with another upper level trough following on Saturday and Sunday. 29 Marine A slow-moving frontal system will continue to cross the area waters this morning, bringing gusty winds to the coastal waters, the Eastern Strait of Juan de Fuca, Admiralty Inlet, and the Northern Inland Waters. Frequent gusts to gale force will continue for East Strait through the late morning hours. Winds will then ease again by this afternoon for a brief lull in between systems. Latest observations continue show steep seas across the coastal waters with seas around 10 ft with dominant periods around 8 to 12 seconds. Seas will become less steep through the morning and will gradually subside back to 8 to 9 ft. A stronger frontal system will then move across the area waters Tuesday into Wednesday, likely bringing gales to the coastal waters, the Eastern Strait of Juan de Fuca, and portions of the Northern Inland Waters. Confidence remains high in the occurrence of gales, with latest probabilistic guidance showing a 75-90 percent probability of gale gusts across the coastal waters and a 45-55 percent probability across the East Strait/Northern Interior Waters. Thus, a Gale Watch remains in effect for these areas. Elsewhere, the majority of the remaining marine zones will likely see gusty winds of at least SCA (Small Craft Advisory) criteria during this period. Waves over the coastal waters will build towards 15-18 ft and will primarily be southerly associated with the frontal passage, then will transition to more westerly by Wednesday. Winds will decrease through the day Thursday and into Friday as the low pressure system associated with the front weakens and starts to move inland. Seas will gradually fall back below 10 ft on Thursday. High pressure will then build back into the northeastern Pacific late in the week, shifting winds back to the northwest over the coastal waters. 14/62 NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Gale Warning until 11am PDT this morning for East Entrance U.S. Waters Strait Of Juan De Fuca. Gale Watch from late tonight through Wednesday morning 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- East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory until 11am PDT this morning for Admiralty Inlet 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- Northern Inland Waters Including The San Juan Islands. |
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