Jul 30, 2021
A weakening inverted trough over northern Sonora along with an upper level jet positioned along the West Coast provided the necessary forcing needed to get thunderstorm development during the afternoon and evening across southeast California on the 30th. Deep moisture in place allowed for thunderstorms to produce locally heavy rainfall, which resulted in multiple instances of flash flooding. Some thunderstorms became strong to severe, leading to isolated cases of damaging wind gusts and localize
Source: NOAA National Weather Service Storm Events Database (event 977292). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Riverside County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.