Logo

Contra Costa County Alerts
Noaa Logo 2
NOAA's National Weather Service
Each location shows all alerts on one page
WARNINGS - WATCHES - ADVISORIES - STATEMENTS
Updates every 15 Minutes
Alert Summary | Alert RSS Feed | Alert Archives | Icon key
Updated:January 2, 2026 8:01 am PST

Coastal Flood Warning COASTAL FLOOD WARNING  
Contra Costa County

  Effective: Fri, 1/2 6:42am Severity:  Severe 
  Updated: January 2, 2026 8:01 am Urgency: Expected
  Expires: Fri, 1/2 3:00pm Certainty: Likely

Areas Affected: San Francisco - North Bay Interior Valleys - San Francisco Bay Shoreline
 
Alert Details:
* 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.

Information:
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 COASTAL FLOOD ADVISORY  
Contra Costa County

  Effective: Fri, 1/2 6:42am Severity: Minor
  Updated: January 2, 2026 8:01 am Urgency: Expected
  Expires: Fri, 1/2 3:00pm Certainty: Likely

Areas Affected: San Francisco - North Bay Interior Valleys - San Francisco Bay Shoreline
 
Alert Details:
* 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.

Information:
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 WIND ADVISORY  
Contra Costa County

  Effective: Fri, 1/2 5:44am Severity:  Moderate 
  Updated: January 2, 2026 8:01 am Urgency: Expected
  Expires: Fri, 1/2 2:00pm Certainty: Likely

Areas Affected: San Francisco - Marin Coastal Range - Sonoma Coastal Range - North Bay Interior Mountains - Coastal North Bay Including Point Reyes National Seashore - San Francisco Peninsula Coast - Santa Cruz Mountains - 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...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.

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