Live National Weather Service alerts, NEXRAD weather radar, USGS river and stream gauges, Storm Prediction Center convective outlooks, Local Storm Reports, 5-day forecast, air quality, and severe-weather notifications for Contra Costa County, CA (FIPS 06013) in California. Free, no login, no ads.
Contra Costa County, CA is one of the counties of California covered by BloomWX. Contra Costa County, CA has a population of approximately 1,162,648 (2022 estimate, US Census Bureau). The county covers 716.9 square miles of land area. The county seat is Martinez.
Concord, Antioch, Richmond, San Ramon, Pittsburg.
Contra Costa County, CA is served by the National Weather Service MTR forecast office for warnings, watches, advisories, and decision-support services. The same office produces the Hazardous Weather Outlook, Area Forecast Discussion, and DSS briefing packets you'll see on the BloomWX dashboard for this county.
BloomWX also covers the surrounding counties: Solano County, CA, Sacramento County, CA, Alameda County, CA, San Joaquin County, CA.
BloomWX is a free weather operations dashboard for SKYWARN storm spotters, emergency management volunteers, ham radio nets, and anyone in Contra Costa County, CA who needs the official NWS data without the consumer-app cruft. Data is pulled directly from weather.gov and refreshes every 60 seconds. Sources: National Weather Service, Storm Prediction Center, USGS Water Data, NOAA Space Weather Prediction Center, Open-Meteo (Air Quality), and the Citizen Weather Observer Program.
Read the BloomWX learn library for beginner-friendly explainers on every dashboard surface, including SPC convective outlooks (TSTM/MRGL/SLGT/ENH/MDT/HIGH), NEXRAD radar, USGS flood gauges, and WPC surface analysis charts. See all California county weather dashboards on BloomWX.