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NOAA's National Weather Service
Each location shows all alerts on one page
WARNINGS - WATCHES - ADVISORIES - STATEMENTS
Updates every 15 Minutes
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| San Mateo County | ||
| Effective: Tue, 12/23 1:09pm | Severity: Severe | |
| Updated: December 24, 2025 2:16 am | Urgency: Expected | |
| Expires: Wed, 12/24 4:00am | Certainty: Likely | |
| Areas Affected: Marin Coastal Range - Sonoma Coastal Range - Coastal North Bay Including Point Reyes National Seashore - San Francisco Peninsula Coast - Santa Lucia Mountains and Los Padres National Forest - Southern Monterey Bay and Big Sur Coast | ||
Alert
Details:
* 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...Until 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. Information: 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. |
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| San Mateo County | ||
| Effective: Tue, 12/23 1:09pm | Severity: Moderate | |
| Updated: December 24, 2025 2:16 am | Urgency: Expected | |
| Expires: Wed, 12/24 4:00am | Certainty: Likely | |
| Areas Affected: North Bay Interior Mountains - North Bay Interior Valleys - San Francisco Bay Shoreline - East Bay Interior Valleys - Santa Cruz Mountains - Santa Clara Valley Including San Jose - Eastern Santa Clara Hills - East Bay Hills - Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park | ||
Alert
Details:
* WHAT...Southeast winds 20 to 30 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 Santa Cruz Mountains, Most of San Benito County and the Cholame Hills in Southeast Monterey County, North Bay Interior Mountains, and North Bay Interior Valleys. * WHEN...Until 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. Information: Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. |
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| San Mateo County | ||
| Effective: Tue, 12/23 11:39pm | Severity: Severe | |
| Updated: December 24, 2025 2:16 am | Urgency: Future | |
| Expires: Wed, 12/24 3:00pm | Certainty: Possible | |
| Areas Affected: San Francisco - San Francisco Bay Shoreline - San Francisco Peninsula Coast - East Bay Interior Valleys - Santa Cruz Mountains - Santa Clara Valley Including San Jose - Eastern Santa Clara Hills - East Bay Hills - Southern Salinas Valley/Arroyo Seco and Lake San Antonio - Santa Lucia Mountains and Los Padres National Forest - Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park - Northern Salinas Valley/Hollister Valley and Carmel Valley - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast | ||
Alert
Details:
* WHAT...Flooding caused by excessive rainfall continues to be possible from multiple lines of showers and thunderstorms, strong at times, moving across the area. * WHERE...San Francisco County, San Mateo Peninsula, East Bay, South Bay, and Central Coast * 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... - Numerous lines of showers and thunderstorms will move across the Bay Area and Central Coast through Friday evening. An additional 1-3" of rain is expected across the interior with locally higher totals between 3-5" 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 Information: 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. |
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| San Mateo County | ||
| Effective: Tue, 12/23 8:03pm | Severity: Moderate | |
| Updated: December 24, 2025 2:16 am | Urgency: Expected | |
| Expires: Wed, 12/24 6:00am | Certainty: Likely | |
| Areas Affected: San Francisco - Coastal North Bay Including Point Reyes National Seashore - San Francisco Peninsula Coast - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast | ||
Alert
Details:
* WHAT...Hazardously strong coastal winds and jets will lead to blowing and drifting sand, wind waves up to 20 ft, and result in poor visibility along coastal beaches. * WHERE...Beaches along the Pacific Coast. * WHEN...Through 4 AM Friday. * IMPACTS...Dangerous coastal and near coastal conditions. Water rescues may be affected by poor visibility from sea spray and blowing sand. Potential for increased erosion. Information: Dangerous conditions are forecast along the shoreline. It is recommended to avoid the coast during this time. Never turn your back to the ocean. |
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