Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Hazardous Weather Conditions

Small Craft Advisory until December 27, 09:00 AM PST

Last Update: 256 AM PST Sat Dec 27 2025

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San Francisco Bay Area/Monterey, CA Local Forecast Office

12NM SW San Francisco CA

Marine Zone Forecast

Today

NW wind 15 to 20 kt, becoming N 10 to 15 kt this afternoon. Seas 7 to 10 ft, subsiding to 5 to 8 ft this afternoon. Wave detail: W 10 ft at 11 seconds and S 4 ft at 12 seconds.

Tonight

N wind 5 to 10 kt. Seas 5 to 7 ft. Wave detail: NW 6 ft at 10 seconds and S 3 ft at 15 seconds.

Sun

NE wind 5 to 10 kt. Seas 3 to 5 ft. Wave detail: NW 5 ft at 9 seconds and S 2 ft at 14 seconds.

Sun Night

NE wind 5 to 10 kt, rising to 10 to 15 kt after midnight. Seas 3 to 4 ft. Wave detail: NW 4 ft at 10 seconds.

Mon

NE wind 10 to 15 kt. Seas 3 to 4 ft. Wave detail: NW 3 ft at 9 seconds.

Mon Night

NE wind 5 to 10 kt, rising to 10 to 15 kt after midnight. Seas around 3 ft. Wave detail: NW 3 ft at 9 seconds.

Tue

NE wind 10 to 15 kt. Seas 3 to 4 ft. Wave detail: NW 3 ft at 13 seconds.

Tue Night

NE wind 5 to 10 kt. Seas 3 to 4 ft. Wave detail: NW 4 ft at 13 seconds.

Wed

E wind 5 to 10 kt. Seas 3 to 4 ft. Wave detail: NW 4 ft at 12 seconds. A chance of rain in the afternoon.

Wed Night

E wind around 5 kt. Seas 3 to 4 ft. Wave detail: W 4 ft at 12 seconds. A chance of rain.

.....san francisco bar/fourfathom bank forecast.....

in the deep water channel...mixed seas of 9 to 12 feet at 9 seconds.

across the bar...mixed seas of 10 to 14 feet at 9 seconds. Maximum ebb current of 2.0 kt at 10:08 am saturday and 1.8 kt at 10:01 pm saturday.