Napa County, California weather alerts
No watches, warnings or advisories are in force for Napa County.
Checked Sun, Sep 20, 2026, 5:42 PM PDT. Times are Pacific Daylight Time.
Warnings on the map
Every watch, warning and advisory the National Weather Service has in force over Napa County, California. Open it for the live map, where it pans and zooms.
Open the live map with warnings and watches
Map layer from NOAA National Weather Service. Boundaries from the Iowa Environmental Mesonet.
Alerts in force
Nothing is in force for Napa County right now. Its warnings come from the National Weather Service and appear here within a minute of being issued; every one of the past year is below.
The past year in Napa County
In the past year the National Weather Service issued 77 alerts for Napa County, including 2 flash flood warnings, 1 coastal flood warning, 1 extreme cold warning and 1 high wind warning.
| Product | Issued | Most recent |
|---|---|---|
| Flash Flood Warning | 2 | Nov 16, 2025 |
| Coastal Flood Warning | 1 | Jan 2, 2026 |
| Extreme Cold Warning | 1 | Feb 20, 2026 |
| High Wind Warning | 1 | Dec 23, 2025 |
| Red Flag Warning | 1 | Jun 10, 2026 |
| Extreme Cold Watch | 1 | Jan 9, 2026 |
| Flood Watch | 1 | Dec 20, 2025 |
| High Wind Watch | 1 | Dec 23, 2025 |
| Dense Fog Advisory | 20 | Aug 29, 2026 |
| Coastal Flood Advisory | 13 | Sep 8, 2026 |
| Cold Weather Advisory | 11 | Feb 21, 2026 |
| Flood Advisory | 10 | Feb 17, 2026 |
| Heat Advisory | 7 | Sep 8, 2026 |
| Wind Advisory | 7 | May 17, 2026 |
Warnings issued
- Red Flag Warning
- Extreme Cold Warning
- Coastal Flood Warning
- High Wind Warning
- Flash Flood Warning
- Flash Flood Warning
Every alert, most recent first
- Coastal Flood Advisory
- Heat Advisory
- Coastal Flood Advisory
- Dense Fog Advisory
- Heat Advisory
- Coastal Flood Advisory
- Heat Advisory
- Heat Advisory
- Heat Advisory
- Coastal Flood Advisory
- Heat Advisory
- Red Flag Warning
- Coastal Flood Advisory
- Wind Advisory
- Coastal Flood Advisory
- Heat Advisory
- Dense Fog Advisory
- Cold Weather Advisory
- Extreme Cold Warning
- Cold Weather Advisory
- Flood Advisory
- Coastal Flood Advisory
- Dense Fog Advisory
- Coastal Flood Advisory
- Coastal Flood Advisory
- Dense Fog Advisory
- Cold Weather Advisory
- Cold Weather Advisory
- Cold Weather Advisory
- Cold Weather Advisory
- Extreme Cold Watch
- Cold Weather Advisory
- Flood Advisory
- Flood Advisory
- Coastal Flood Advisory
- Flood Advisory
- Wind Advisory
- Coastal Flood Warning
- Coastal Flood Advisory
- Cold Weather Advisory
The 40 most recent of 77.
From the Iowa Environmental Mesonet’s archive of NWS watches, warnings and advisories (VTEC), by the county’s own code and the forecast zones inside it. Each date links to the event at the IEM.
Nearby
The counties around Napa County, with what is in force in each.
What this means
- Warning
- The hazard is happening or about to. Act now: a tornado warning means take shelter, a flash flood warning means move to higher ground.
- Watch
- Conditions favor the hazard. Nothing is happening yet; have a plan and be ready to act if a warning follows.
- Advisory
- A hazard that is less serious than a warning but can still cause trouble, such as dense fog, heat or light ice.
- Statement
- Information about weather that does not yet meet a warning: a strong storm, a hydrologic update, or a special weather statement.
Severity (extreme, severe, moderate, minor) is the rating the issuing office gives each product. More on the difference: tornado watch vs. tornado warning. Alerts come from the National Weather Service; follow its instructions and your local officials.
Sources
Alerts from the National Weather Service's public feed, read afresh every minute, and matched to counties and zones by their UGC codes. Warnings from outside the United States come from each country's own meteorological service. Follow the issuing office's instructions and your local officials.