Sep 2, 2019
Upper level high pressure centered over the Four Corners ushered in moisture from the southeast into SoCal starting on Labor Day. Monsoon thunderstorms impacted the mountains and deserts September 2 through 5th. The event started with a nocturnal MCS over the Coachella Valley early in the morning on September 2nd, dumping 1-1.5 inches over a couple of hours. Even more thunderstorms formed Monday afternoon, especially in the mountains. Hail was reported on I-8 Monday afternoon. Storms continued e
Source: NOAA National Weather Service Storm Events Database (event 858096). 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.