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Updated:December 29, 2025 11:45 am PST

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Los Angeles County

  Effective: Mon, 12/29 2:38am Severity: Minor
  Updated: December 29, 2025 11:45 am Urgency: Expected
  Expires: Mon, 12/29 3:00pm 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 1.3 ft of inundation above ground level is
possible in low lying areas near shorelines and tidal waterways.

* WHERE...Bayshore locations along San Francisco and Monterey Bay.

* 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...The San Francisco tidal gauge high tide is
expected to be 1.02 ft above normal (6.86 ft MLLW) at 7:51 AM
Wednesday, 1.21 ft above normal (7.05 ft MLLW) at 8:41 AM
Thursday, 1.32 ft above normal (7.16 ft MLLW) at 9:34 AM Friday,
1.29 ft above normal (7.13 ft MLLW) at 10:26 AM Saturday, and
1.08 ft above normal (6.92 ft MLLW) at 11:18 AM Sunday. High
tide timing varies up to 90 minutes earlier or later along the
Pacific Coast and throughout the San Francisco Bay respectively.
There is a chance these higher tides coincide with storm surge
during an active weather period, so actual tidal levels may be
slightly higher than forecast.

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.
Coastal Flood Advisory COASTAL FLOOD ADVISORY  
Marin County

  Effective: Mon, 12/29 2:38am Severity: Minor
  Updated: December 29, 2025 11:45 am Urgency: Expected
  Expires: Mon, 12/29 3:00pm 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 1.3 ft of inundation above ground level is
possible in low lying areas near shorelines and tidal waterways.

* WHERE...Bayshore locations along San Francisco and Monterey Bay.

* 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...The San Francisco tidal gauge high tide is
expected to be 1.02 ft above normal (6.86 ft MLLW) at 7:51 AM
Wednesday, 1.21 ft above normal (7.05 ft MLLW) at 8:41 AM
Thursday, 1.32 ft above normal (7.16 ft MLLW) at 9:34 AM Friday,
1.29 ft above normal (7.13 ft MLLW) at 10:26 AM Saturday, and
1.08 ft above normal (6.92 ft MLLW) at 11:18 AM Sunday. High
tide timing varies up to 90 minutes earlier or later along the
Pacific Coast and throughout the San Francisco Bay respectively.
There is a chance these higher tides coincide with storm surge
during an active weather period, so actual tidal levels may be
slightly higher than forecast.

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.
Cold Weather Advisory COLD WEATHER ADVISORY  
Los Angeles County

  Effective: Mon, 12/29 11:36am Severity:  Moderate 
  Updated: December 29, 2025 11:45 am Urgency: Expected
  Expires: Mon, 12/29 9:00pm Certainty: Likely

Areas Affected: North Bay Interior Mountains - North Bay Interior Valleys - East Bay Interior Valleys - 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
 
Alert Details:
* WHAT...Cold conditions with temperatures as low as 33 expected.

* WHERE...The East Bay Hills and Valleys, Interior Monterey County
and the Santa Lucia Range, Most of San Benito County and the
Cholame Hills in Southeast Monterey County, North Bay Interior
Mountains, North Bay Interior Valleys, Eastern Santa Clara Hills,
and Southern Salinas Valley/Arroyo Seco and Lake San Antonio.

* WHEN...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.

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.
Cold Weather Advisory COLD WEATHER ADVISORY  
Marin County

  Effective: Mon, 12/29 11:36am Severity:  Moderate 
  Updated: December 29, 2025 11:45 am Urgency: Expected
  Expires: Mon, 12/29 9:00pm Certainty: Likely

Areas Affected: North Bay Interior Mountains - North Bay Interior Valleys - East Bay Interior Valleys - 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
 
Alert Details:
* WHAT...Cold conditions with temperatures as low as 33 expected.

* WHERE...The East Bay Hills and Valleys, Interior Monterey County
and the Santa Lucia Range, Most of San Benito County and the
Cholame Hills in Southeast Monterey County, North Bay Interior
Mountains, North Bay Interior Valleys, Eastern Santa Clara Hills,
and Southern Salinas Valley/Arroyo Seco and Lake San Antonio.

* WHEN...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.

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.