Napa County, CA Weather Alerts
Every National Weather Service alert issued for Napa County, California, pushed to your phone within moments — county code CAC055, forecast zone 2 zones (CAZ506, CAZ504). Free with StormCast.
Download on Google PlayHow the NWS identifies Napa County
These are the identifiers the National Weather Service uses when it issues a warning here. StormCast watches CAC055 directly rather than matching on place names, which is why an alert arrives whether you are in American Canyon or anywhere else in the county.
NWS County Code
CAC055
Forecast Zones
2 zones (CAZ506, CAZ504)
Forecast Office
Monterey (MTR)
Radar Station
KDAX
Towns covered in Napa County
An NWS alert for Napa County applies to all 10 of these communities. You do not need a separate alert for each one.
River gauges in and around Napa County
StormCast tracks 12 gauges near Napa County. Set a flood-stage alert on any of them to get notified before the water reaches you.
- Lake Hennessey
- Conn Dam Spillway
- Conn Creek at Lake Hennessey
- Napa River near St. Helena
- Sulphur Creek at Pope Street
- Chiles Creek at Lake Hennessey
- Sulphur Creek at White Sulphur Springs Road
- York Creek at Highway 29
- Hopper Creek at Highway 29
- Napa River at Yountville Cross Road
- Sage Creek at Lake Hennessey
- Napa River at Lodi Lane
Current conditions
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Alert types issued for Napa County
Tornado
Tornado Warning, Tornado Watch, Tornado Emergency and Severe Thunderstorm Warning.
How tornado alerts work →Flooding
Flash Flood Warning, Flood Watch, Flood Advisory and River Flood Warning.
How flood alerts work →Winter
Winter Storm Warning, Ice Storm Warning, Blizzard Warning and Winter Weather Advisory.
Winter warnings explained →Fire Weather
Red Flag Warning and Fire Weather Watch when conditions favor rapid fire spread.
Fire weather alerts →Heat & Cold
Excessive Heat Warning, Heat Advisory, Freeze Warning and Frost Advisory.
Frost & freeze alerts →Napa County weather alert questions
Which NWS forecast zone is Napa County in?
Napa County, California is NWS county code CAC055 and spans 2 forecast zones (CAZ506, CAZ504). Alerts for it are issued by the Monterey (MTR) Weather Forecast Office, and the nearest NEXRAD radar is KDAX.
Which towns in Napa County are covered?
All of them. NWS alerts are issued at the county and zone level, so a warning for Napa County covers every community inside it, including American Canyon, Angwin, Calistoga, Deer Park, Napa, Oakville, Pope Valley, Rutherford, Saint Helena and Yountville.
Are there river gauges in Napa County?
Yes — StormCast monitors 12 river gauges in and around Napa County, including Lake Hennessey , Conn Dam Spillway , Conn Creek at Lake Hennessey. You can set a flood-stage alert on any of them and get a push notification when the water rises.
How fast are alerts for Napa County delivered?
StormCast polls the NWS alert feed every 30 seconds. When a warning is issued for CAC055, the push notification goes out within moments — even with your screen off.