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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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| Los Angeles County | ||
| Effective: Mon, 12/29 1:13pm | Severity: Minor | |
| Updated: December 30, 2025 12:16 am | Urgency: Expected | |
| Expires: Tue, 12/30 5:00am | Certainty: Likely | |
| Areas Affected: San Francisco - Coastal North Bay Including Point Reyes National Seashore - North Bay Interior Valleys - San Francisco Bay Shoreline - San Francisco Peninsula Coast - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast | ||
Alert
Details:
* WHAT...Up to 1.8 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...San Francisco Bay and San Pablo Bay shoreline, Monterey Bay shoreline, and the Pacific Coast. * WHEN...From 5 AM Wednesday to 2 PM PST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be: 1.5 ft above normal (7.36 ft MLLW) at 7:51 AM Wednesday 12/31 1.7 ft above normal (7.55 ft MLLW) at 8:41 AM Thursday 1/1 1.8 ft above normal (7.66 ft MLLW) at 9:34 AM Friday 1/2 1.8 ft above normal (7.63 ft MLLW) at 10:26 AM Saturday 1/3 1.6 ft above normal (7.42 ft MLLW) at 11:18 AM Sunday 1/4 These predictions include 0.5 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. Information: 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. |
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| Marin County | ||
| Effective: Mon, 12/29 1:13pm | Severity: Minor | |
| Updated: December 30, 2025 12:16 am | Urgency: Expected | |
| Expires: Tue, 12/30 5:00am | Certainty: Likely | |
| Areas Affected: San Francisco - Coastal North Bay Including Point Reyes National Seashore - North Bay Interior Valleys - San Francisco Bay Shoreline - San Francisco Peninsula Coast - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast | ||
Alert
Details:
* WHAT...Up to 1.8 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...San Francisco Bay and San Pablo Bay shoreline, Monterey Bay shoreline, and the Pacific Coast. * WHEN...From 5 AM Wednesday to 2 PM PST Sunday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be: 1.5 ft above normal (7.36 ft MLLW) at 7:51 AM Wednesday 12/31 1.7 ft above normal (7.55 ft MLLW) at 8:41 AM Thursday 1/1 1.8 ft above normal (7.66 ft MLLW) at 9:34 AM Friday 1/2 1.8 ft above normal (7.63 ft MLLW) at 10:26 AM Saturday 1/3 1.6 ft above normal (7.42 ft MLLW) at 11:18 AM Sunday 1/4 These predictions include 0.5 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. Information: 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. |
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| Los Angeles County | ||
| Effective: Mon, 12/29 9:51pm | Severity: Moderate | |
| Updated: December 30, 2025 12:16 am | Urgency: Expected | |
| Expires: Tue, 12/30 9:00am | Certainty: Likely | |
| Areas Affected: North Bay Interior Valleys | ||
Alert
Details:
* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Cold Weather Advisory, cold conditions with temperatures as low as 36 expected. * WHERE...North Bay Interior Valleys. * WHEN...For the Dense Fog Advisory, until 10 AM PST Tuesday. For the Cold Weather Advisory, from 1 AM to 9 AM PST Tuesday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken. Low visibility could make driving conditions hazardous. Information: Ensure portable heaters are working properly and are used correctly to avoid sparking a fire indoors. Do not use generators or grills inside as carbon monoxide poisoning can result. Check with your local, city, or county officials for information on available warming centers. Be sure to dress in layers if outdoors. Make sure that pets and livestock have adequate food, unfrozen water, and warmth. Cover or tend to sensitive crops, plants, and vegetation. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. If commuting, allow extra drive time to reach your destination safely. |
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| Marin County | ||
| Effective: Mon, 12/29 9:51pm | Severity: Moderate | |
| Updated: December 30, 2025 12:16 am | Urgency: Expected | |
| Expires: Tue, 12/30 9:00am | Certainty: Likely | |
| Areas Affected: North Bay Interior Valleys | ||
Alert
Details:
* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Cold Weather Advisory, cold conditions with temperatures as low as 36 expected. * WHERE...North Bay Interior Valleys. * WHEN...For the Dense Fog Advisory, until 10 AM PST Tuesday. For the Cold Weather Advisory, from 1 AM to 9 AM PST Tuesday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken. Low visibility could make driving conditions hazardous. Information: Ensure portable heaters are working properly and are used correctly to avoid sparking a fire indoors. Do not use generators or grills inside as carbon monoxide poisoning can result. Check with your local, city, or county officials for information on available warming centers. Be sure to dress in layers if outdoors. Make sure that pets and livestock have adequate food, unfrozen water, and warmth. Cover or tend to sensitive crops, plants, and vegetation. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. If commuting, allow extra drive time to reach your destination safely. |
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| Los Angeles County | ||
| Effective: Mon, 12/29 9:51pm | Severity: Moderate | |
| Updated: December 30, 2025 12:16 am | Urgency: Expected | |
| Expires: Tue, 12/30 9:00am | Certainty: Likely | |
| Areas Affected: North Bay Interior Valleys | ||
Alert
Details:
* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Cold Weather Advisory, cold conditions with temperatures as low as 36 expected. * WHERE...North Bay Interior Valleys. * WHEN...For the Dense Fog Advisory, until 10 AM PST Tuesday. For the Cold Weather Advisory, from 1 AM to 9 AM PST Tuesday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken. Low visibility could make driving conditions hazardous. Information: Ensure portable heaters are working properly and are used correctly to avoid sparking a fire indoors. Do not use generators or grills inside as carbon monoxide poisoning can result. Check with your local, city, or county officials for information on available warming centers. Be sure to dress in layers if outdoors. Make sure that pets and livestock have adequate food, unfrozen water, and warmth. Cover or tend to sensitive crops, plants, and vegetation. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. If commuting, allow extra drive time to reach your destination safely. |
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| Marin County | ||
| Effective: Mon, 12/29 9:51pm | Severity: Moderate | |
| Updated: December 30, 2025 12:16 am | Urgency: Expected | |
| Expires: Tue, 12/30 9:00am | Certainty: Likely | |
| Areas Affected: North Bay Interior Valleys | ||
Alert
Details:
* WHAT...For the Dense Fog Advisory, visibility one quarter mile or less in dense fog. For the Cold Weather Advisory, cold conditions with temperatures as low as 36 expected. * WHERE...North Bay Interior Valleys. * WHEN...For the Dense Fog Advisory, until 10 AM PST Tuesday. For the Cold Weather Advisory, from 1 AM to 9 AM PST Tuesday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken. Low visibility could make driving conditions hazardous. Information: Ensure portable heaters are working properly and are used correctly to avoid sparking a fire indoors. Do not use generators or grills inside as carbon monoxide poisoning can result. Check with your local, city, or county officials for information on available warming centers. Be sure to dress in layers if outdoors. Make sure that pets and livestock have adequate food, unfrozen water, and warmth. Cover or tend to sensitive crops, plants, and vegetation. If driving, slow down, use your headlights, and leave plenty of distance ahead of you. If commuting, allow extra drive time to reach your destination safely. |
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