San Juan Islands and Northern Inland Waters Marine Forecast
| Tonight...Sw Wind 5 To 10 Kt, Backing To S After Midnight. Waves Around 2 Ft Or Less. A Slight Chance Of Rain Early This Evening, Then A Chance Of Rain Late This Evening And Overnight. |
| Fri...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. |
| Fri Night...E Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Sat...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain In The Morning, Then Rain Likely In The Afternoon. |
| Sat Night...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. Rain Likely. |
| Sun...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. Rain. |
| Sun Night...Se Wind 15 To 20 Kt. Waves Around 2 Ft Or Less. Rain. |
| Mon...Se Wind 15 To 20 Kt, Easing To 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less. Rain. |
| Mon Night...Se Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. Rain Likely, Mainly In The Evening. |
| Tue...E Wind Around 5 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain In The Morning. |
| Tue Night...E Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Area Forecast Discussion National Weather Service Seattle WA 749pm PST Thu Jan 8 2026 The Winter Storm Warning for the Cascades expired earlier this afternoon. Weakening convergence zone activity is still capable of bringing additional, though light, accumulations to the passes. Please check with WSDOT for the latest road conditions over the passes before traveling. Elsewhere, light showers are moving into the Pacific coast, with more isolated coverage within Puget Sound. 21 Synopsis Lowland rain and mountain snow showers will taper off tonight into Friday morning leading to a brief period of dry weather before the next system arrives late Saturday. Moderate to heavy rain is expected at times Saturday night into early Tuesday along with snow levels rising above pass level. Area rivers are expected to rise, and flooding cannot be completely ruled out by early next week. Drier conditions are favored to return by the middle of next week. Short Term - Tonight Through Saturday Night Expect lows overnight to be in the low 40s and upper 30s for much of Puget Sound, with freezing conditions in the mountains. Otherwise, expect a relatively dry period with no significant weather impacts by late Friday morning lingering through early Saturday before the next system arrives. Long Term - Sunday Through Thursday The forecast for the long term period has certainly become more interesting over the last 24-48 hours. Ensemble guidance has largely trended upward across the board in terms of atmospheric river activity impacting the Pacific Northwest between late Saturday and early Tuesday. There is still some disagreement in the amount of precipitation and the overall temperature profile, which in turn leads to quite a bit of hydrologic uncertainty. However, in general expect periods of moderate to heavy rainfall, with the highest risk of flooding being along rivers originating from the central/northern Cascades, as well as the Skokomish River in Mason County (see theHydrology ction for more detail). This potential AR activity also brings with it the potential for an elevated wind and landslide risk. Currently 90th percentile wind gusts approach advisory criteria, so it's far from a sure thing, but it's something that will need to be monitored. Once we move past this period, upper level ridging becomes favored, leading to a high likelihood of relatively dry conditions mid to late next week. These dry conditions are also favored to persist into the week 2 time frame. Though cooler temperatures may also start to be favored out that far. -Wolcott- Marine Seas will continue a slow downward trend this evening. High pressure will build over area waters this evening and continue through Friday. High pressure will shift inland on Saturday as a weak frontal system pushes through the waters, with additional systems expected over the weekend into early next week likely bringing additional headlines. High pressure expected to rebuild over the waters on Tuesday. 29 Hydrology No river flooding is expected through Saturday.However, ensemble precipitation guidance has trended up over the last 24 hours, leading to an increased concern for potential river flooding. At this time, the main risk of river flooding is along the Skokomish River in Mason County, where the crest has been updated to just below moderate flood stage Monday. A Hydrologic Outlook has been issued for Mason County. Elsewhere, rivers are certainly expected to rise, but confidence in rivers reaching flood levels is less than 30%. The relative risk appears to be highest for rivers originating from the central and northern Cascades, where snow levels will rise from around 4000 feet to 7500-8000 feet during the event, bringing rain on snow into the picture. Fortunately, this event is likely to be followed by a relatively dry period, allowing for rivers to fall mid to late next week. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory until 10am PST Friday for Grays Harbor Bar Small Craft Advisory until 6pm PST Friday for West Entrance USA Waters Strait Of Juan De Fuca. Small Craft Advisory until 4am PST 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- 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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