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

Elevation Above Sea Level: 0 feet / 0 meters

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

GPS Coordinates: 37.8272222, -122.4216667

Nearby Water Temperatures

High Wind Watch issued December 22 at 12:58PM PST until December 24 at 4:00AM PST by NWS San Francisco CA

Effective: Mon December 22, 2025, 12:58 PM
Expires: Tue December 23, 2025, 10:00 AM

* WHAT...South winds 20 to 30 mph with gusts up to 60 mph possible. * WHERE...The Bay Area, The Central Coast, The Santa Clara Valley and Eastern Hills, The Salinas and Carmel Valleys and Hollister Area, The Santa Cruz Mountains, and San Francisco Peninsula Coast. * WHEN...From Tuesday evening through early Wednesday morning. * IMPACTS...Damaging winds could down trees, snap power lines, and result in property damage. Widespread power outages are possible. Travel could be extremely difficult and hazardous, especially for high profile vehicles. The combination of wind and moist soils will increase the risk for downed trees.

Monitor the latest forecasts and warnings for updates. Secure loose outdoor objects that could be blown around or damaged by the wind.

Flood Watch issued December 22 at 11:58AM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Mon December 22, 2025, 11:58 AM
Expires: Tue December 23, 2025, 6:00 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...San Francisco County, San Mateo Peninsula, East Bay, South Bay, and Central Coast * WHEN...From Tuesday morning through Friday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low water crossings may become flooded. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - A series of atmospheric rivers will result in multiple rounds of moderate to heavy rainfall this week across the Bay Area and Central Coast. An additional 2-4" of rain is expected across the interior with locally higher totals between 4-6" across the Santa Cruz Mountains and up to 8" across the Santa Lucia Range. Flooding potential will increase with each successive round of rain. Sharp rises in smaller creeks and streams are expected with at least some potential for minor flooding in mainstream rivers. - 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.

Wind Advisory issued December 22 at 5:59PM PST until December 24 at 4:00AM PST by NWS San Francisco CA

Effective: Mon December 22, 2025, 5:59 PM
Expires: Tue December 23, 2025, 2:00 AM

* WHAT...Southeast winds 25 to 35 mph with gusts up to 55 mph expected. * WHERE...The East Bay and San Francisco Bay Shoreline, The Santa Clara Valley and Eastern Hills, The Salinas and Carmel Valleys and Hollister Area, Northern Monterey Bay, The Santa Cruz Mountains, Most of San Benito County and the Cholame Hills in Southeast Monterey County, San Francisco, North Bay Interior Mountains, and North Bay Interior Valleys. * WHEN...From 4 PM Tuesday to 4 AM PST Wednesday. * 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. Secure loose outdoor objects that could be blown around or damaged by the wind.

High Wind Warning issued December 22 at 5:59PM PST until December 24 at 4:00AM PST by NWS San Francisco CA

Effective: Mon December 22, 2025, 5:59 PM
Expires: Tue December 23, 2025, 2:00 AM

* WHAT...Southeast winds 30 to 40 mph with gusts up to 65 mph expected. Isolated areas along the coast may see a few gusts up to 75 mph. * WHERE...Southern Monterey Bay and the Big Sur Coast, The Marin Hills, Western Sonoma County Hills, Interior Monterey County and the Santa Lucia Range, Coastal North Bay Including Point Reyes National Seashore, and San Francisco Peninsula Coast. * WHEN...From 4 PM Tuesday to 4 AM PST Wednesday. * IMPACTS...Damaging winds will blow down trees and power lines. Widespread power outages are expected. Travel will be difficult, especially for high profile vehicles. Damaging winds could down trees, snap power lines, and result in property damage. Widespread power outages are possible. Travel could be extremely difficult and hazardous, especially for high profile vehicles.

People are urged to secure loose objects that could be blown around or damaged by the wind. Secure loose outdoor objects that could be blown around or damaged by the wind.

Flood Watch issued December 22 at 11:58AM PST until December 26 at 10:00PM PST by NWS San Francisco CA

Effective: Mon December 22, 2025, 11:58 AM
Expires: Tue December 23, 2025, 6:00 AM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Northern San Francisco Bay Area (Napa, Sonoma, and Marin counties). * WHEN...Through Friday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. Low water crossings may become flooded. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Multiple rounds of moderate to heavy rainfall are expected across the North Bay this week. An additional 6-8" is possible over the North Bay Mountains and 4-5" over the North Bay Valleys by Friday. Nuisance flooding will increase throughout the week with sharp rises in smaller creeks and minor flooding along some of the mainstream rivers (Russian River, Napa River). Debris flows are possible particularly for the Pickett Burn Scar. - 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.

Flood Watch issued December 22 at 1:30PM PST until December 26 at 4:00PM PST by NWS Sacramento CA

Effective: Mon December 22, 2025, 1:30 PM
Expires: Tue December 23, 2025, 4:00 PM

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...A portion of northern California, including the following areas, the Sacramento Valley, northern San Joaquin Valley, Delta region, Sierra Nevada and adjacent foothills, and Coastal Range. * WHEN...Through Friday 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... - Periods of moderate to heavy rain are forecast the week of Christmas. Debris flows are not expected over recent burn scars in northern California, but do anticipate enhanced runoff in/below scars. - 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.

High Wind Watch issued December 22 at 10:25AM PST until December 26 at 4:00PM PST by NWS Sacramento CA

Effective: Mon December 22, 2025, 10:25 AM
Expires: Tue December 23, 2025, 4:00 PM

* WHAT...South winds 25 to 35 mph with gusts up to 60 mph possible. * WHERE...Carquinez Strait and Delta, Sacramento Valley, Motherlode, Northeast Foothills, and Northern San Joaquin Valley. * WHEN...From Tuesday afternoon through Friday afternoon. * IMPACTS...Strong winds and saturated soils could blow down trees and power lines resulting in widespread power outages. Strong winds may cause impacts to unsecured items, including temporary structures and holiday decorations. Travel could be difficult, especially for high profile vehicles. * ADDITIONAL DETAILS...Strongest wind gusts expected in the northern Sacramento Valley and adjacent foothills on Wednesday.

Monitor the latest forecasts and warnings for updates.