Coastal flood advisory extends through Sunday for Northern California
National Weather Service warns of minor to moderate coastal flooding from astronomical high tides and thermal expansion through early November.
What to know
- A coastal flood advisory covering Northern California coastlines from the North Bay to Big Sur remains in effect until Sunday, November 1 at 6 p.m., with inundation levels up to 1.5–1.9 feet expected.
- The flooding is driven by astronomical high tides combined with thermal expansion, a recurring hazard during certain tidal cycles.
- The advisory has been extended multiple times since its initial October 27 issuance as conditions persisted through the weekend, with intensity downgraded from moderate to minor-to-moderate by October 30.
National Weather Service San Francisco Issuing authority
How it unfolded 8 developments, newest first · click a bar or a number to jump articlesposts
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Coastal flood advisory confirmed through Sunday at 6 p.m.
The National Weather Service confirmed the Coastal Flood Advisory remains in effect until 6 p.m. PDT Sunday, with up to 1.5 feet of inundation for affected coastal areas.
“COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT SUNDAY…”
— National Weather Service · source -
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384 WHUS46 KMTR 311145 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 445 AM PDT Sat Oct 31 2026 CAZ006-506-508-529-530-010100- /O.CON.KMTR.CF.Y.0014.000000T0000Z-261102T0200Z/ San Francisco-North Bay Interior Valleys- San Francisco Bay Shoreline-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 445 AM PDT…
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094 FXUS66 KMTR 311135 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 435 AM PDT Sat Oct 31 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1030 PM PDT Fri Oct 30 2026 - Minor to moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the weekend - Seasonal to slightly below…
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895 FXUS66 KMTR 310549 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1049 PM PDT Fri Oct 30 2026 ...New SHORT TERM, LONG TERM, AVIATION... .KEY MESSAGES... Updated at 1030 PM PDT Fri Oct 30 2026 - Minor to moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the weekend - Seasonal to…
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Forecast lowers intensity to minor-to-moderate coastal flooding through weekend
Updated Area Forecast Discussion predicted minor to moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the weekend, with seasonal to slightly below seasonal temperatures.
“Minor to moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the weekend…”
— National Weather Service · source -
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457 FXUS66 KMTR 301606 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 906 AM PDT Fri Oct 30 2026 ...New UPDATE, MARINE... .KEY MESSAGES... Updated at 1200 AM PDT Fri Oct 30 2026 - Moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the weekend - Seasonal to slightly below seasonal…
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497 FXUS66 KMTR 301917 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1217 PM PDT Fri Oct 30 2026 ...New SHORT TERM, LONG TERM... .KEY MESSAGES... Updated at 1213 PM PDT Fri Oct 30 2026 - Minor to moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the weekend - Seasonal to slightly…
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Coastal flood advisory extended through Sunday evening
The National Weather Service extended the Coastal Flood Advisory until 6 p.m. PDT Sunday, November 2, with up to 1.9 feet of inundation predicted for multiple coastal zones.
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855 WHUS46 KMTR 292210 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 310 PM PDT Thu Oct 29 2026 CAZ006-506-508-529-530-302300- /O.EXT.KMTR.CF.Y.0014.000000T0000Z-261102T0200Z/ San Francisco-North Bay Interior Valleys- San Francisco Bay Shoreline-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 310 PM PDT…
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925 FXUS66 KMTR 291746 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1046 AM PDT Thu Oct 29 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1203 AM PDT Thu Oct 29 2026 - Moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through Friday and Saturday - Seasonal to slightly below…
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604 FXUS66 KMTR 300404 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 904 PM PDT Thu Oct 29 2026 ...New UPDATE... .KEY MESSAGES... Updated at 107 PM PDT Thu Oct 29 2026 - Moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through Friday; coastal flooding continues for Bayshore locations on…
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Forecast upgraded to moderate coastal flooding through the week
Area Forecast Discussion indicated moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the week, with potential for rain this weekend and early to mid next week.
“Moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the week…”
— National Weather Service · source -
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236 WHUS46 KMTR 282046 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 146 PM PDT Wed Oct 28 2026 CAZ006-506-508-529-530-291215- /O.CON.KMTR.CF.Y.0014.000000T0000Z-261101T0100Z/ San Francisco-North Bay Interior Valleys- San Francisco Bay Shoreline-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 146 PM PDT…
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274 FXUS66 KMTR 281140 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 440 AM PDT Wed Oct 28 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1227 AM PDT Wed Oct 28 2026 - Moderate coastal flooding at high tide for Bayshore and Pacific Coast locations through the week - Seasonal to slightly below seasonal…
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Coastal flood advisory extended to Saturday evening
The National Weather Service extended the Coastal Flood Advisory until 6 p.m. PDT Saturday, with up to 1.9 feet of inundation forecast.
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659 WHUS46 KMTR 280720 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1220 AM PDT Wed Oct 28 2026 CAZ006-506-508-529-530-282200- /O.EXT.KMTR.CF.Y.0014.000000T0000Z-261101T0100Z/ San Francisco-North Bay Interior Valleys- San Francisco Bay Shoreline-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 1220 AM PDT…
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National Weather Service issues coastal flood advisory until Friday
The National Weather Service issued a Coastal Flood Advisory for San Francisco-North Bay Interior Valleys, San Francisco Bay Shoreline, Northern Monterey Bay, and Southern Monterey Bay and Big Sur Coast, in effect until 5 p.m. PDT Friday, with up to 2.1 feet of inundation predicted.
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1 outlet Coastal flood advisory issued for North Bay and San Francisco Peninsula Coast until Saturday evening
first by Mercury News, 8d ago
1 more headline
- Coastal flood advisory for Northern California until Sunday evening Mercury News · 8d ago
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839 WHUS46 KMTR 271241 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 541 AM PDT Tue Oct 27 2026 CAZ006-506-508-529-530-272200- /O.CON.KMTR.CF.Y.0014.000000T0000Z-261031T0000Z/ San Francisco-North Bay Interior Valleys- San Francisco Bay Shoreline-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 541 AM PDT…
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825 FXUS66 KMTR 270348 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 848 PM PDT Mon Oct 26 2026 ...New MARINE... .KEY MESSAGES... Updated at 226 PM PDT Mon Oct 26 2026 - Coastal flooding at high tide by Bayshore and Pacific Coast locations through the week. Worst flooding along bayshore Marin County. - Seasonally cool…
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Worst coastal flooding expected along Marin County bayshore
Forecast discussion identified coastal flooding at high tide by Bayshore and Pacific Coast locations through the week, with the worst flooding predicted along bayshore Marin County.
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901 FXUS66 KMTR 260437 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 937 PM PDT Sun Oct 25 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1226 PM PDT Sun Oct 25 2026 - Minor coastal flooding at high tide for Bayshore and Pacific Coast locations through much of the week - Cool conditions through the week -…
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background
Minor coastal flooding predicted at high tide through the week — Updated forecast discussion warned of minor coastal flooding at high tide for Bayshore and Pacific Coast locations through much of the week, with cool conditions expected.
- 1 day quiet
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National Weather Service forecasts coastal flooding from tides and thermal expansion
The National Weather Service San Francisco office issued an Area Forecast Discussion identifying coastal flooding due to astronomical high tides and thermal expansion expected from the weekend through Thursday.
“Coastal flooding due to astronomical high tides and thermal expansion this weekend through Thursday…”
— National Weather Service · source -
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461 FXUS66 KMTR 241616 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 916 AM PDT Sat Oct 24 2026 ...New UPDATE, MARINE... .KEY MESSAGES... Updated at 914 AM PDT Sat Oct 24 2026 - Near normal temperatures this weekend, cooling to slightly below normal through the remainder of the upcoming week - Coastal flooding due to…
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