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 Sierra County, CA (FIPS 06091) in California. Free, no login, no ads.
Sierra County, CA is one of the counties of California covered by BloomWX. Sierra County, CA has a population of approximately 2,916 (2022 estimate, US Census Bureau). The county covers 953.2 square miles of land area. The county seat is Downieville.
Loyalton, Downieville.
Sierra County, CA is served by the National Weather Service STO 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: Yuba County, CA, Plumas County, CA, Nevada County, CA, Washoe County, NV, Lassen County, CA.
BloomWX is a free weather operations dashboard for SKYWARN storm spotters, emergency management volunteers, ham radio nets, and anyone in Sierra 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.