Super Typhoon Sinlaku to Impact the Marianas and Guam; Severe Weather Threat from the Central Plains to the Great Lakes
Super Typhoon Sinlaku will bring destructive winds, widespread heavy rain/flooding, and thunderstorms to the Marianas Islands into Wednesday. Tropical Storm conditions are likely over Guam. Severe thunderstorms and heavy rain are likely across the Upper Mississippi Valley and Great Lakes region with potential for large to very large hail, damaging wind, and tornadoes through Tuesday. Read More >
Hazardous Weather Conditions
Last Update: 842 AM PDT Mon Apr 13 2026
For More Weather Information:
12NM SW San Francisco CA
Marine Zone Forecast
Today
NW wind 5 to 10 kt, rising to 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave detail: W 5 ft at 10 seconds and S 3 ft at 14 seconds.
Tonight
NW wind 15 to 20 kt. Seas 5 to 7 ft. Wave detail: NW 7 ft at 7 seconds and SW 2 ft at 15 seconds.
Tue
NW wind 15 to 20 kt, easing to 10 to 15 kt in the afternoon. Seas 5 to 7 ft. Wave detail: NW 6 ft at 8 seconds and SW 2 ft at 14 seconds.
Tue Night
NW wind 15 to 20 kt. Seas 4 to 6 ft. Wave detail: NW 5 ft at 8 seconds and SW 2 ft at 14 seconds.
Wed
NW wind 10 to 15 kt. Seas 3 to 5 ft. Wave detail: NW 5 ft at 7 seconds.
Wed Night
NW wind 10 to 15 kt, rising to 15 to 20 kt after midnight. Seas around 3 ft, building to 4 to 6 ft after midnight. Wave detail: NW 5 ft at 6 seconds.
Thu
NW wind 20 to 25 kt, easing to 15 to 20 kt in the afternoon. Seas 5 to 8 ft. Wave detail: NW 7 ft at 7 seconds.
Thu Night
NW wind 20 to 25 kt, becoming N 15 to 20 kt after midnight. Seas 6 to 9 ft. Wave detail: NW 8 ft at 9 seconds.
Fri
N wind 5 to 10 kt. Seas 4 to 6 ft. Wave detail: NW 6 ft at 10 seconds and SW 3 ft at 10 seconds.
Fri Night
NW wind 10 to 15 kt. Seas 3 to 5 ft. Wave detail: S 2 ft at 8 seconds and NW 4 ft at 9 seconds.
.....san francisco bar/fourfathom bank forecast.....
in the deep water channel...mixed seas of 4 to 6 feet at 11 seconds.
across the bar...swell can be more than twice as high across the bar than surrounding waters. Waves are also more prone to break, particularly during strong ebb currents. Maximum ebb current of 2.0 kt at 02:21 pm monday and 2.5 kt at 02:57 am tuesday.
.....san francisco bar/fourfathom bank forecast.....
in the deep water channel...mixed seas of 4 to 6 feet at 11 seconds.
across the bar...swell can be more than twice as high across the bar than surrounding waters. Waves are also more prone to break, particularly during strong ebb currents. Maximum ebb current of 2.0 kt at 02:21 pm monday and 2.5 kt at 02:57 am tuesday.
Additional Forecasts and Information
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