San Mateo County, CA
Alerts
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Alerts are listed in order of start time and level of severity. Click on the alert title to read details for each alert.
In effect from Friday 10/30 3:58 PM PDT – Saturday 10/31 6:00 PM PDT
Issued by NWS San Francisco CA
What
Up to 1.9 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways.
Where
Pacific Coast.
When
Until 6 PM PDT Saturday.
Impacts
High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas.
Additional Details
At the San Francisco tidal gauge, high tide is expected to be 1.9 ft above normal (7.7 ft MLLW) at 02:39 PM Friday 10/30, and 1.5 feet above normal (7.3 ft MLLW) at 03:44 PM on Saturday 10/31. These predictions include up to 1.5 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.
What to Do
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Areas Impacted
- Coastal North Bay Including Point Reyes National Seashore
- San Francisco Peninsula Coast
Tips to Stay Safe
A Flood Advisory is issued when flooding may cause significant inconvenience, or even become dangerous if you are not careful. Know your risk at home, work and school, and use caution when flooding is expected.
- Be aware of low-lying areas along your travel routes that are most likely to flood.
- Check road conditions before traveling, and obey road closures and barricades.
- Never walk, swim, or drive through flood waters.
- Stay tuned for local weather updates on the situation as it develops.
In effect from Friday 10/30 3:58 PM PDT – Sunday 11/01 6:00 PM PST
Issued by NWS San Francisco CA
What
Up to 1.9 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways.
Where
Bay Shoreline locations of San Pablo Bay, San Francisco Bay, and Monterey Bay.
When
Until 6 PM PDT Sunday.
Impacts
High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas. More substantial impacts are expected along bayshore Marin County where increased flooding is anticipated across low lying areas.
Additional Details
At the San Francisco tidal gauge, high tide is expected to be 1.5 feet above normal (7.3 ft MLLW) at 03:44 PM on Saturday 10/31, and 1.0 ft above normal (6.8 ft MLLW) on Sunday 11/01 at 3:59 PM. These predictions include up to 1.5 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.
What to Do
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Areas Impacted
- San Francisco
- North Bay Interior Valleys
- San Francisco Bay Shoreline
- Northern Monterey Bay
- Southern Monterey Bay and Big Sur Coast
Tips to Stay Safe
A Flood Advisory is issued when flooding may cause significant inconvenience, or even become dangerous if you are not careful. Know your risk at home, work and school, and use caution when flooding is expected.
- Be aware of low-lying areas along your travel routes that are most likely to flood.
- Check road conditions before traveling, and obey road closures and barricades.
- Never walk, swim, or drive through flood waters.
- Stay tuned for local weather updates on the situation as it develops.
Briefings
From the Forecaster
Coastal Flood Advisory through Sunday
Created by the NWS San Francisco WFO
🌊 COASTAL FLOOD ADVISORY EXTENDED THROUGH THE WEEKEND 🌊 The Coastal Flood Advisory has been extended across low-lying coastal and bayfront areas due to elevated water levels around times of peak high tide. Up to 1.9 feet of inundation above ground level is possible near shorelines, parking lots, and tidal waterways. TIMING & LOCATIONS: Pacific Coast: Extended until 6:00 PM Saturday San Pablo Bay, San Francisco Bay, and Monterey Bay: Extended until 6:00 PM Sunday IMPACTS & SAFETY PRECAUTIONS: Low-lying coastal roads, walkways, and docks may experience minor flooding during high tide cycles. Allow extra commute time if traveling near vulnerable shorelines, as some roads may become impassable or closed. Turn Around, Don't Drown: Do not drive around barricades or attempt to drive through water of unknown depth. Take precautions now to secure or protect flood-prone property. Monitor local tide tables and stay tuned for forecast updates: weather.gov/BayArea
Seven-day Weather Risk Overview
The graphic shows the daily risk summary for 7 days. Daily risk is based on highest risk factor for that day.
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