Central U.S. Waters Strait of Juan de Fuca Marine Forecast
| Tonight...W Wind Around 5 Kt, Backing To S After Midnight. Waves Around 2 Ft Or Less. |
| Tue...E Wind Around 5 Kt, Veering To W 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less. |
| Tue Night...W Wind 20 To 25 Kt, Rising To 25 To 30 Kt After Midnight. Waves 3 To 4 Ft, Building To 4 To 6 Ft After Midnight. |
| Wed...W Wind 5 To 10 Kt, Rising To 10 To 15 Kt In The Afternoon. Waves Around 3 Ft In The Morning, Then Around 2 Ft Or Less. |
| Wed Night...W Wind 10 To 15 Kt. Waves Around 3 Ft. |
| Thu...W Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain In The Afternoon. |
| Thu Night...W Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. |
| Fri...W Wind 5 To 10 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain In The Afternoon. |
| Fri Night...W Wind 10 To 15 Kt. Waves Around 2 Ft Or Less, Then Around 3 Ft After Midnight. A Chance Of Rain. |
| Sat...W Wind 10 To 15 Kt. Waves Around 2 Ft Or Less. A Chance Of Rain In The Afternoon. |
| Sat Night...W Wind 10 To 15 Kt. Waves Around 3 Ft. |
| Area Forecast Discussion National Weather Service Seattle WA 808pm PDT Monday August 24 2026 Synopsis An upper ridge will remain over Western Washington through Tuesday bringing dry, warm conditions. Upper low approaches the area midweek for the return of onshore flow, cooler temperatures, and chances of precipitation. Upper troughing will continue to influence the region into next weekend maintaining cooler, cloudier conditions. Short Term - Tonight Through Wednesday Night Hazy skies this evening as smoke from nearby wildfires continues to filter into Western Washington. Outside of smoke, mostly clear skies this evening. Otherwise, no major updates to the forecast. Refer to an updated aviation discussion. Upper ridging continues to build into the Pacific Northwest today, with mostly clear skies and warming temperatures. North winds exist at the surface with more east flow aloft in the mid levels. The east wind component aloft is allowing for wildfire smoke from the Cascades to drift into Western Washington this afternoon. This will continue through midday Tuesday. Onshore flow resumes later Tuesday, which will push the smoke eastwards outside of the area by Tuesday night. Otherwise, temperatures will peak on Tuesday with the ridge axis over the interior Pac NW, with highs in the 80s to low 90s over Puget Sound, warmest temperatures in the Cascade Valleys. Moderate HeatRisk is expected Tuesday for the interior. An upper low approaches Western Washington on Wednesday, leading to cooler temperatures and more widespread morning stratus. Additionally, flow aloft will become more south-southwest, and will need to monitor the slight chance for thunderstorms in the North Cascades during the afternoon. Temperatures drop into the 70s to low 80s Wednesday, with 60s along the coast. Long Term - Thursday Through Monday Upper troughing moves across the Pacific Northwest Thursday, resulting in rain potential for portions of Western Washington, along with cooler temperatures. Ensembles suggest another trough moves southwards out of British Columbia overhead late Friday into Saturday for additional Quantitative Precipitation Forecast chances and reinforced onshore flow. Onshore flow then continues early next week. Temperatures are expected to be below normal during this period, with highs only in the mid 60s to mid 70s. JD Marine Surface high pressure remains over the coastal waters into Tuesday. North winds will increase along the coastal waters this afternoon and evening, with periodic Small Craft Advisory wind gusts. A thermal trough along the coast will slide inland on Tuesday, with increasing onshore flow into Wednesday. A westerly push is expected through the Strait of Juan de Fuca Tuesday evening. Probabilities for SCA (Small Craft Advisory) wind gusts in the Strait during this period range 60 to 90%, and for this reason a Small Craft Advisory has been issued. Otherwise, winds transition to the south and southwest for all waters midweek. Onshore flow then continues through late week, with periods of stronger west winds through the Strait of Juan de Fuca. Seas of 4 to 6 feet for the majority of the week. Seas may be choppy through this evening for the coastal waters due to a period of around 6 seconds. JD Fire Weather A warming and drying trend will continue through Tuesday as a thermal trough builds northward along the coast. Offshore easterly flow will strengthen tonight into Tuesday, promoting additional drying near the Cascade gaps, where relative humidity values are expected to drop to near critical values in the low to mid 20s on Tuesday. Elevated fire weather conditions will continue through Tuesday for these areas. A pattern change late Tuesday into Wednesday will bring the return of moist onshore flow, cooler temperatures, and chances of light precipitation through the remainder of the week, mitigating fire weather concerns for most areas. Isolated thunderstorms along the coast and over higher terrain are possible with each round of moisture, though the exact details remain somewhat uncertain. Upper level troughing is favored to remain over the Pacific Northwest over the weekend, with continued onshore flow, excellent overnight relative humidity recoveries, and cooler temperatures. Chances for thunderstorms continue into the weekend, with around a 15-25% chance across both the mountains and lowlands. NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory from 5pm Tuesday to 2am PDT Wednesday for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. Small Craft Advisory until midnight PDT tonight 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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