Heat Builds in the West; Severe Thunderstorms and Heavy Rain in the Upper Midwest and Mid-Mississippi Valley; Extremely Critical Fire Weather in the Northwest on Saturday
A heat wave over the Southwest will intensify this week, peaking and expanding into the Intermountain West and northern High Plains this weekend. Severe thunderstorms and heavy rainfall are expected over parts of the Upper Midwest to mid-Mississippi Valley today. Critical to extremely critical fire weather conditions from the Northwest and the northern Great Basin on Saturday and Sunday. Read More >
Hazardous Weather Conditions
Last Update: 210 AM PDT Fri Jul 31 2026
For More Weather Information:
12NM SW San Francisco CA
Marine Zone Forecast
Today
NW wind 10 to 15 kt, rising to 15 to 20 kt this afternoon. Seas 4 to 6 ft. Wave detail: NW 5 ft at 8 seconds and S 2 ft at 14 seconds.
Tonight
NW wind 15 to 20 kt. Seas 6 to 9 ft. Wave detail: NW 7 ft at 8 seconds and S 2 ft at 13 seconds.
Sat
NW wind 15 to 20 kt. Gusts up to 35 kt in the afternoon. Seas 5 to 7 ft. Wave detail: NW 6 ft at 8 seconds and S 2 ft at 13 seconds.
Sat Night
NW wind 20 to 25 kt with gusts up to 40 kt. Seas 7 to 10 ft. Wave detail: NW 9 ft at 10 seconds.
Sun
NW wind 15 to 20 kt. Seas 6 to 9 ft. Wave detail: NW 8 ft at 10 seconds.
Sun Night
NW wind 15 to 20 kt. Gusts up to 35 kt after midnight. Seas 7 to 10 ft. Wave detail: NW 9 ft at 10 seconds.
Mon
NW wind 10 to 15 kt, becoming W 5 to 10 kt in the afternoon. Seas 6 to 9 ft. Wave detail: NW 8 ft at 11 seconds.
Mon Night
W wind 5 to 10 kt, backing to SW after midnight. Seas 5 to 7 ft. Wave detail: NW 6 ft at 10 seconds.
Tue
S wind 5 to 10 kt. Seas 4 to 6 ft. Wave detail: NW 6 ft at 10 seconds.
Tue Night
SW wind around 5 kt. Seas 3 to 5 ft. Wave detail: NW 5 ft at 9 seconds.
.....san francisco bar/fourfathom bank forecast.....
in the deep water channel...mixed seas of 4 to 6 ft at 17 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 3.0 kt at 06:12 am friday and 1.8 kt at 06:53 pm friday.
.....san francisco bar/fourfathom bank forecast.....
in the deep water channel...mixed seas of 4 to 6 ft at 17 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 3.0 kt at 06:12 am friday and 1.8 kt at 06:53 pm friday.
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