West Entrance U.S. Waters Strait of Juan de Fuca Marine Forecast
| Today...W Wind 5 To 10 Kt. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 13 Seconds. |
| Tonight...W Wind 5 To 10 Kt. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 12 Seconds. |
| Tue...W Wind Around 5 Kt, Rising To 5 To 10 Kt In The Afternoon. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 12 Seconds. |
| Tue Night...W Wind 5 To 10 Kt, Backing To S After Midnight. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 11 Seconds. A Chance Of Rain. |
| Wed...S Wind Around 5 Kt, Veering To W Around 5 Kt In The Afternoon. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 12 Seconds. |
| Wed Night...W Wind 5 To 10 Kt, Veering To N After Midnight. Seas 3 To 5 Ft. Wave Detail: W 5 Ft At 11 Seconds. |
| Thu...E Wind Around 5 Kt, Backing To N Around 5 Kt In The Afternoon. Seas 3 To 4 Ft. Wave Detail: W 4 Ft At 10 Seconds. A Chance Of Rain. |
| Thu Night...W Wind 5 To 10 Kt. Seas 3 To 4 Ft. Wave Detail: W 4 Ft At 10 Seconds. Rain Likely, Mainly In The Evening. |
| Fri...W Wind 5 To 10 Kt. Seas 3 To 5 Ft. Wave Detail: W 4 Ft At 10 Seconds. A Chance Of Rain In The Morning. |
| Fri Night...W Wind 5 To 10 Kt. Seas 3 To 5 Ft. Wave Detail: W 4 Ft At 9 Seconds. |
| Area Forecast Discussion National Weather Service Seattle WA 812pm PDT Sunday September 20 2026 Synopsis An upper ridge remains in place across the Pacific Northwest through tonight. The ridge flattens Monday into Tuesday as a frontal system tracks into British Columbia. Deeper troughing develops later Thursday into Friday for more widespread precipitation potential. Short Term - Tonight Through Tuesday Night The current forecast remains on track with no planned updates tonight. 33 Previous discussion...Mostly sunny skies this afternoon with lingering stratus clearing across portions of Southwest Washington. Dry conditions through tonight with an upper ridge over the Pacific Northwest. Temperatures peaking in the 60s to low 70s today. Another round of stratus is expected Monday morning across Western Washington, clearing for some afternoon sunshine. The upper ridge also shifts eastwards on Monday as a frontal system moves into British Columbia. This will result in increased onshore flow late Monday into Tuesday for additional clouds. Temperatures Monday and Tuesday will peak in the 60s to low 70s. Long Term - Wednesday Through Sunday A weakening frontal system brushes the area late Tuesday night through Wednesday, bringing slight POPs to northern portions of the Olympic Peninsula and Skagit County northwards. Troughing deepens offshore Thursday as a more organized system approaches the Pacific Northwest. Ensembles are consistent in troughing overhead into Friday, although some uncertainty remains into the depth of the trough. Either way, more widespread precipitation potential exists Thursday night into Friday associated with the frontal system moving across the Pacific Northwest. Snow levels during this period range 6500 to 8000 feet resulting in high elevation mountain snowfall. Ensembles suggest a weak troughing to zonal flow signal by next weekend, with predominantly drier conditions and cooler temperatures. JD Marine High pressure will persist over the offshore waters into Monday. A weak front moves into British Columbia later Monday into Tuesday, resulting in increased onshore flow. Probabilities for Small Craft Advisory west wind gusts range between 70 to 90% Monday night for the central and eastern Strait of Juan de Fuca, and for this reason issued a SCA (Small Craft Advisory) for these areas. Another westerly push is expected Tuesday night, but at this time the stronger winds are confined to the Canadian side of the Strait. A weakening front then moves across the waters on Wednesday, with another weather system late Thursday into Friday. Seas of 3 to 5 feet through Monday morning will build to 7 to 9 feet Monday night as a longer period northwesterly swell arrives across the Coastal Waters. Brief 10 foot seas may occur over the outer Coastal Waters Monday night. Seas then subside to 6 to 8 feet Tuesday afternoon through Friday. JD NOAA Seattle WA Office: Watches - Warnings - Advisories WA...None. PZ...Small Craft Advisory from 3pm Monday to midnight PDT Monday night for Central U.S. Waters Strait Of Juan De Fuca- East Entrance U.S. Waters Strait Of Juan De Fuca. |
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