Contra Costa County, CA Weather Alerts
Every National Weather Service alert issued for Contra Costa County, California, pushed to your phone within moments — county code CAC013, forecast zone 3 zones (CAZ510, CAZ515, CAZ508). Free with StormCast.
Download on Google PlayHow the NWS identifies Contra Costa County
These are the identifiers the National Weather Service uses when it issues a warning here. StormCast watches CAC013 directly rather than matching on place names, which is why an alert arrives whether you are in Alamo or anywhere else in the county.
NWS County Code
CAC013
Forecast Zones
3 zones (CAZ510, CAZ515, CAZ508)
Forecast Office
Monterey (MTR)
Radar Station
KDAX
Towns covered in Contra Costa County
An NWS alert for Contra Costa County applies to all 30 of these communities. You do not need a separate alert for each one.
River gauges in and around Contra Costa County
StormCast tracks 12 gauges near Contra Costa County. Set a flood-stage alert on any of them to get notified before the water reaches you.
- Grayson Creek at Taylor Blvd (City Yard)
- Galindo Creek at Treat Blvd
- Walnut Creek at Diamond Blvd Bridge
- Walnut Creek at Ygnacio Valley Road
- Grayson Creek at Center Ave
- Tice Creek at Rossmoor Basin
- Walnut Creek at Marsh Drive
- Alhambra Creek at D Street
- Alhambra Creek at Ward St
- Green Valley Creek at Diablo Road
- San Francisco Bay Port Chicago Tide Gage
- Sacramento-San Joaquin Delta at Mallard Island
Current conditions
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Alert types issued for Contra Costa 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 →Contra Costa County weather alert questions
Which NWS forecast zone is Contra Costa County in?
Contra Costa County, California is NWS county code CAC013 and spans 3 forecast zones (CAZ510, CAZ515, CAZ508). Alerts for it are issued by the Monterey (MTR) Weather Forecast Office, and the nearest NEXRAD radar is KDAX.
Which towns in Contra Costa County are covered?
All of them. NWS alerts are issued at the county and zone level, so a warning for Contra Costa County covers every community inside it, including Alamo, Antioch, Bethel Island, Brentwood, Byron, Canyon, Clayton, Concord, Crockett, Danville, Diablo, Discovery Bay, El Cerrito, El Sobrante, Hercules, Knightsen, Lafayette, Martinez, Moraga, Oakley, Orinda, Pinole, Pittsburg, Pleasant Hill, Port Costa, Richmond, Rodeo, San Pablo, San Ramon and Walnut Creek.
Are there river gauges in Contra Costa County?
Yes — StormCast monitors 12 river gauges in and around Contra Costa County, including Grayson Creek at Taylor Blvd (City Yard), Galindo Creek at Treat Blvd, Walnut Creek at Diamond Blvd Bridge. 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 Contra Costa County delivered?
StormCast polls the NWS alert feed every 30 seconds. When a warning is issued for CAC013, the push notification goes out within moments — even with your screen off.