Dec 27, 2022
A strong low pressure system moving down the Pacific Coast tapped into sub-tropical moisture, bringing heavy rain and strong winds from the night of December 26th through the 27th. A wind advisory was issued for the immediate coastline and coastal mountains and East Bay Hills. A Flood Watch covered the same coastal areas and the North Bay valleys, and several Urban and Small Stream Flood Advisories were issued for areas under the Watch.
Source: NOAA National Weather Service Storm Events Database (event 1080033). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Contra Costa County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.