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Bay shore flood advisory now runs through Friday, November 13
The National Weather Service says morning high tides could put up to 1.6 feet of water over low-lying ground near San Pablo Bay and San Francisco Bay. The coastal flood advisory runs until 4 p.m. Friday, November 13, 2026. The highest tides are forecast Saturday through Monday, November 7 to 9.
What the advisory covers
A coastal flood advisory is a warning from the National Weather Service, the federal weather forecaster. It means high tides are expected to flood low ground near the water.
The Weather Service's San Francisco office issued this update early Thursday, November 5, 2026. It is the alert the Weather Service lists for Sonoma. It covers two areas it calls the North Bay Interior Valleys and the San Francisco Bay Shoreline. It names no Sonoma towns or roads.
The flooding it describes is on bayshore locations along San Francisco Bay and San Pablo Bay. The water would be in low-lying areas near shorelines and tidal waterways. Tidal waterways are creeks and channels that rise and fall with the tide.
We covered an earlier version of this advisory in our October 29 post.
What the alert says
The advisory is in effect until 4 p.m. Friday, November 13. The Weather Service's San Francisco Bay Area page now shows the same end date.
The alert says up to 1.6 feet of water above ground is possible in low spots. It lists these effects: flooding of low-lying infrastructure, isolated road closures and coastal erosion.
It also gives high tide forecasts for the San Francisco tide gauge, the instrument that measures tide height. They are not readings from San Pablo Bay. These numbers are in feet above a normal tide. Saturday to Monday are the highest:
- Thursday, November 5, 8:35 a.m.: 1.3 feet.
- Friday, November 6, 9:08 a.m.: 1.4 feet.
- Saturday, November 7, 9:38 a.m.: 1.6 feet.
- Sunday, November 8, 10:06 a.m.: 1.6 feet.
- Monday, November 9, 10:35 a.m.: 1.6 feet.
- Tuesday, November 10: 1.5 feet.
- Wednesday, November 11, and Thursday, November 12: 1.4 feet.
- Friday, November 13, 12:49 p.m.: 1.2 feet.
The alert says these numbers include up to 1.5 feet of surge, which is extra water on top of the normal tide. It says high tide varies by up to 90 minutes: earlier along the Pacific Coast and later through San Francisco Bay.
What it means for you
- If you drive near the bay shore or creeks that rise and fall with the tide, the Weather Service says to allow extra time. Some roads may be closed. Do not drive around barricades or through water of unknown depth.
- If you own property near the water, the Weather Service says to take the necessary actions to protect flood-prone property. Its office page says to take precautions now.
- If you are on a beach or the shore, the alert says rising tides bring water and waves farther up the beach than normal. That can cut off the way back from the beach.
- To check for changes, use the Weather Service's San Francisco Bay Area page.
What happens next
The advisory ends at 4 p.m. Friday, November 13, unless the Weather Service changes it.
A separate event comes later. The California Coastal Commission lists the year's highest predicted tides, called king tides, for November 24 to 26. See our post on king tides.
Where this came from
The National Weather Service San Francisco Bay Area coastal flood message issued at 2:05 a.m. Thursday, November 5, 2026, and the office's home page, both read November 5. The king tide dates come from the California Coastal Commission's King Tides Project page.
Sources
- National Weather Service San Francisco Bay Area, Coastal Flood Advisory text for Sonoma, issued November 5, 2026
- National Weather Service San Francisco Bay Area home page, read November 5, 2026
- California Coastal Commission, California King Tides Project (page checked October 26, 2026)
Checked 2026-11-05. Rules and programs change. If something here is out of date, the source above wins. Spot an error? See our corrections policy.
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