Station Name: SAN FRANCISCO BAY A NE SHORE ALCATRAZ ISLAND CA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
Alcatraz Island
San Francisco, CA 94133-1312
San Francisco County

GPS Coordinates: 37.8272222, -122.4216667

Nearby Water Temperatures

Coastal Flood Warning issued January 2 at 6:42AM PST until January 3 at 2:00PM PST by NWS San Francisco CA

Effective: Fri January 2, 2026, 6:42 AM
Expires: Fri January 2, 2026, 3:00 PM

* WHAT...For the Coastal Flood Warning, significant coastal flooding expected due to high astronomical tides and storm surge. Up to 2.5 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways during the morning high tide Friday and Saturday. For the Coastal Flood Advisory, up to 2.0 ft inundation is possible. * WHERE...San Francisco and San Pablo Bays. * WHEN...For the Coastal Flood Warning, from 7 AM Friday to 2 PM PST Saturday. For the Coastal Flood Advisory, from 2 PM Saturday to 2 PM PST Sunday. * IMPACTS...Numerous roads will be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be: 2.2 ft above normal (8.0 ft MLLW) at 9:34 AM Friday 1/2 2.5 ft above normal (8.3 ft MLLW) at 10:26 AM Saturday 1/3 1.9 ft above normal (7.7 ft MLLW) at 11:18 AM Sunday 1/4 These predictions include up to 1.3 feet of storm 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.

Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth.

Coastal Flood Advisory issued January 2 at 6:42AM PST until January 4 at 2:00PM PST by NWS San Francisco CA

Effective: Fri January 2, 2026, 6:42 AM
Expires: Fri January 2, 2026, 3:00 PM

* WHAT...For the Coastal Flood Warning, significant coastal flooding expected due to high astronomical tides and storm surge. Up to 2.5 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways during the morning high tide Friday and Saturday. For the Coastal Flood Advisory, up to 2.0 ft inundation is possible. * WHERE...San Francisco and San Pablo Bays. * WHEN...For the Coastal Flood Warning, from 7 AM Friday to 2 PM PST Saturday. For the Coastal Flood Advisory, from 2 PM Saturday to 2 PM PST Sunday. * IMPACTS...Numerous roads will be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be: 2.2 ft above normal (8.0 ft MLLW) at 9:34 AM Friday 1/2 2.5 ft above normal (8.3 ft MLLW) at 10:26 AM Saturday 1/3 1.9 ft above normal (7.7 ft MLLW) at 11:18 AM Sunday 1/4 These predictions include up to 1.3 feet of storm 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.

Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth.

Wind Advisory issued January 2 at 5:44AM PST until January 3 at 1:00PM PST by NWS San Francisco CA

Effective: Fri January 2, 2026, 5:44 AM
Expires: Fri January 2, 2026, 2:00 PM

* WHAT...South winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...The Central Coast, The Salinas and Carmel Valleys and Hollister Area, The Marin Hills, Western Sonoma County Hills, The Santa Cruz Mountains, San Francisco, North Bay Interior Mountains, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast, and East Bay Hills. * WHEN...From 1 PM Friday to 1 PM PST Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.

Coastal Flood Advisory issued January 2 at 6:42AM PST until January 4 at 2:00PM PST by NWS San Francisco CA

Effective: Fri January 2, 2026, 6:42 AM
Expires: Fri January 2, 2026, 3:00 PM

* WHAT...Up to 2.5 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Pacific Coast from Sonoma County to Monterey County including the Monterey Bay. * WHEN...Until 2 PM PST Sunday. * IMPACTS...Flooding of lots, parks, and roads with some road closures expected. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be: 2.2 ft above normal (8.0 ft MLLW) at 9:34 AM Friday 1/2 2.5 ft above normal (8.3 ft MLLW) at 10:26 AM Saturday 1/3 1.9 ft above normal (7.7 ft MLLW) at 11:18 AM Sunday 1/4 These predictions include up to 1.3 feet of storm 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.

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.

Flood Watch issued January 2 at 9:25AM PST until January 5 at 4:00PM PST by NWS Sacramento CA

Effective: Fri January 2, 2026, 9:25 AM
Expires: Sat January 3, 2026, 4:00 PM

An Atmospheric River Event will bring moderate to heavy rain this evening through Monday evening. The prolonged period of rain will bring the risk of flooding to the Sacramento Valley, Shasta County, northern Sierra Nevada and adjacent foothills, as well as the Coastal Range. This will be for elevations below 4000 feet. * WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of northern California below 4000 feet in elevation, including the following areas, Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills, and Shasta Lake Area / Northern Shasta County. * WHEN...From this evening through Monday afternoon. * IMPACTS...Excessive runoff will result in rises along area rivers, creeks, streams. Small streams and creeks may rise out of their banks. Flooding may occur in low-lying, poor drainage, and urban areas. Mudslides and rockslides may occur in mountain and foothill areas. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.