FZPN23 KWNM 170421 OFFN08 NAVTEX Marine Forecast for northern California waters NWS Ocean Prediction Center Washington DC 921 PM PDT Wed Sep 16 2026 Conditions given represent the highest within that period. ...Please refer to Coastal Waters Forecasts (CWF) available through NOAA Weather Radio and other means for detailed coastal waters forecasts... .SYNOPSIS...A trough will persist along the California coast tonight through Mon night. High pressure will remain centered to the NW of the waters tonight through Mon night. Point Saint George to Point Arena .TONIGHT...N winds 15 to 25 kt. Seas 6 to 9 ft. .THU...N winds 10 to 20 kt. Seas 5 to 8 ft. .THU NIGHT...N winds 5 to 15 kt. Seas 4 to 7 ft. .FRI...N winds 10 to 20 kt. Seas 4 to 6 ft. .FRI NIGHT...N winds 15 to 25 kt. Seas 5 to 7 ft. .SAT...N winds 15 to 25 kt. Seas 4 to 7 ft. .SAT NIGHT...N winds 15 to 25 kt. Seas 4 to 7 ft. .SUN...N winds 15 to 25 kt. Seas 5 to 8 ft. .SUN NIGHT...N winds 15 to 25 kt. Seas 5 to 8 ft. .MON...N winds 15 to 25 kt. Seas 5 to 8 ft. .MON NIGHT...N winds 15 to 25 kt. Seas 5 to 9 ft. Point Arena to Point Piedras Blancas .TONIGHT...NW winds 10 to 20 kt. Seas 5 to 8 ft. .THU...N to NW winds 10 to 20 kt. Seas 5 to 8 ft. .THU NIGHT...N to NW winds 5 to 15 kt. Seas 4 to 7 ft. .FRI...N to NW winds 15 to 25 kt. Seas 4 to 6 ft. .FRI NIGHT...N to NW winds 15 to 25 kt. Seas 5 to 8 ft. .SAT...NW winds 10 to 20 kt. Seas 5 to 8 ft. .SAT NIGHT...N to NW winds 15 to 25 kt. Seas 5 to 8 ft. .SUN...N to NW winds 10 to 20 kt. Seas 5 to 8 ft. .SUN NIGHT...N to NW winds 10 to 20 kt. Seas 5 to 8 ft. .MON...N winds 15 to 25 kt. Seas 5 to 8 ft. .MON NIGHT...N winds 15 to 25 kt. Seas 5 to 9 ft.