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Updated:December 23, 2025 12:31 am PST

Wind Advisory WIND ADVISORY  
Napa County

  Effective: Mon, 12/22 5:59pm Severity:  Moderate 
  Updated: December 23, 2025 12:31 am Urgency: Expected
  Expires: Tue, 12/23 2:00am Certainty: Likely

Areas Affected: San Francisco - 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 - Southern Salinas Valley/Arroyo Seco and Lake San Antonio - Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park - Northern Salinas Valley/Hollister Valley and Carmel Valley - Northern Monterey Bay
 
Alert Details:
* 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.

Information:
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.
Flood Watch FLOOD WATCH  
Napa County

  Effective: Mon, 12/22 11:58am Severity:  Severe 
  Updated: December 23, 2025 12:31 am Urgency: Future
  Expires: Tue, 12/23 6:00am Certainty: Possible

Areas Affected: Marin Coastal Range - Sonoma Coastal Range - North Bay Interior Mountains - Coastal North Bay Including Point Reyes National Seashore - North Bay Interior Valleys
 
Alert Details:
* 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

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.