San Juan Islands and Northern Inland Waters Marine Forecast
| Today...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. Rain Likely Early This Morning, Then A Slight Chance Of Rain Late This Morning. A Chance Of Rain This Afternoon. |
| Tonight...Se Wind 10 To 15 Kt, Rising To 15 To 20 Kt After Midnight. Waves Around 2 Ft Or Less. Rain. |
| Fri...Se Wind 15 To 20 Kt. Waves Around 3 Ft. Rain. |
| Fri Night...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. Rain. |
| Sat...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. Rain. |
| Sat Night...S Wind Around 5 Kt, Backing To E Around 5 Kt After Midnight. Waves Around 2 Ft Or Less. |
| Sun...Ne Wind Around 5 Kt. Waves Around 2 Ft Or Less. |
| Sun Night...Ne Wind 5 To 10 Kt, Becoming Se 10 To 15 Kt After Midnight. Waves Around 2 Ft Or Less. A Chance Of Rain In The Evening, Then Rain Likely After Midnight. |
| Mon...Se Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. Rain. |
| Mon Night...S Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. Rain Likely, Mainly In The Evening. |
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Area Forecast Discussion National Weather Service Seattle WA 248am PDT Thu Mar 27 2025 Synopsis Upper level low remaining off the coast into Friday keeping showers in the forecast. Low weakening to an upper level trough and moving inland Friday night. Next system arriving late in the weekend. Another upper level low off the coast for the first part of next week. Short Term - Today through Saturday A deep, stacked, low continues to spin offshore, with moist S/SW flow across western WA. Still seeing plenty of showers across the region this morning with light to moderate precipitation. The air mass remains slightly unstable today with isolated thunderstorms possible, however, the highest threat is east of the Cascades. Winds will be breezy along the coast and north interior with S/SE gusts to 30-40 mph. Showers will continue tonight into Friday with a focus for heavier precipitation along the coast and Olympics, aided by a trough axis. This may result in renewed flooding of the Skokomish River and a Flood Watch remains in effect for Mason County. Troughing over the region keeps the air mass cool and showery moving into the weekend. On Saturday, snow levels will drop to around 3000 ft with light snow in the mountains and passes. Temperatures return to normal with lows in the 40s and highs in the low to mid 50s. 33 Long Term - Sunday Through Wednesday Weak upper level ridging will bring a brief break to the weather on Sunday. Morning lows will be cooler and in the 30s. Highs may reach the lower 60s in the interior. More wet weather is headed our way early next week as low pressure shifts inland. The mountains will see a few more inches of snow with snow levels hovering around 3000 ft. A trough digs offshore toward midweek, then shifts inland, thus keeping rain in the forecast throughout. 33 Marine 980 mb surface low continues offshore with inclement conditions. Gales will go into effect this morning and remain into tonight over the coastal waters. In addition, an SCA (Small Craft Advisory) will go into effect for East Entrance this morning through at least Friday. More SCAs (Small Craft Advisories) may be needed for neighboring waters such as the Northern Inland zone tonight into Friday. Weak upper level ridge building over the waters Saturday-Saturday night with winds easing. Next surface low associated with the negatively tilted trough late in the weekend staying well offshore. Seas building into the 12 to 15 foot range today will subside to near 10 feet Friday night and Saturday. Seas continuing to subside Sunday into Monday. McMillian Hydrology Precipitation will continue into the first part of next week with Sunday looking like the only dry day at this time. The precipitation is not expected to cause significant rises to area rivers. The exception is the Skokomish River, where heavy showers are favored to bring the Skokomish into flood stage by late Thursday evening. The river will crest near moderate flood stage Friday and remain over flood stage into Saturday. Large uncertainty exists over the amount of precipitation over the basin. Conditions will continue to be closely monitored. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...Flood Watch from this afternoon through Saturday afternoon for Foothills of the Western and Southern Olympic Peninsula- Middle Chehalis River Valley-Olympia and Southern Puget Sound-Olympics-Southern Hood Canal-Willapa and Black Hills. PZ...Small Craft Advisory from noon today to 6am PDT Friday for Grays Harbor Bar Small Craft Advisory from 6am this morning to 6am PDT Friday for East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory until 6am PDT early this 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. Gale Warning from 6am this morning to 2am PDT Friday 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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