Contra Costa County weather alerts
There are no active weather alerts for Contra Costa County, CA right now.
Since 2016 the National Weather Service has issued about 92 alerts that included Contra Costa County, roughly 9 a year. The most common is the flood advisory (81 from 2016 to 2025). No tornado warnings were recorded here in that period. 5 tornadoes have touched down in the county since 1950.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
No warnings, watches or advisories include Contra Costa County at the moment. This page updates automatically when the National Weather Service issues one. Check neighboring San Joaquin County, Sacramento County, Solano County, Alameda County.
Contra Costa County alert history
Alert events that included Contra Costa County or its forecast zones, from the NWS warning archive.
| Alert type | 2016–2025 | 2026 | Last issued |
|---|---|---|---|
| Flood Advisory | 81 | 6 | November 13, 2026 |
| Flood Warning | 6 | 0 | January 10, 2023 |
| Severe Thunderstorm Warning | 3 | 0 | August 16, 2020 |
| Flash Flood Warning | 2 | 0 | December 25, 2025 |
Tornado history in Contra Costa County
5 tornadoes have been recorded in Contra Costa County since 1950. That ranks 27 of 58 counties in California. The most recent was on January 23, 2010 (rated EF1).
Strongest tornadoes in Contra Costa County
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| January 23, 2010 | EF1 | Contra Costa County | 1.6 mi | 2 yd | 0 | 0 |
| December 5, 1998 | F0 | Contra Costa County | 1.5 mi | 150 yd | 0 | 0 |
| September 18, 1989 | F0 | Contra Costa County | 0.2 mi | 10 yd | 0 | 0 |
| September 18, 1989 | F0 | Contra Costa County | 0.2 mi | 10 yd | 0 | 0 |
| February 19, 1998 | F0 | Contra Costa County | 0.2 mi | 30 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | County | Path length | Width | Deaths | Injuries |
|---|---|---|---|---|---|---|
| January 23, 2010 | EF1 | Contra Costa County | 1.6 mi | 2 yd | 0 | 0 |
| December 5, 1998 | F0 | Contra Costa County | 1.5 mi | 150 yd | 0 | 0 |
| February 19, 1998 | F0 | Contra Costa County | 0.2 mi | 30 yd | 0 | 0 |
| September 18, 1989 | F0 | Contra Costa County | 0.2 mi | 10 yd | 0 | 0 |
| September 18, 1989 | F0 | Contra Costa County | 0.2 mi | 10 yd | 0 | 0 |
About Contra Costa County
- Population: 1,172,607 (2024 estimate)
- State: California
- NOAA Weather Radio SAME code: 006013 (how to use it)
- Cities: Concord, Antioch, Richmond