NWS San Diego CAFF.W 0009September 24, 2026
Flash Flood Warning: Riverside and San Bernardino, CA
The National Weather Service office in San Diego issued a flash flood warning for Riverside and San Bernardino in California, which was in force until 7:30 p.m. local time on September 24. It was the 9th flash flood warning the NWS office in San Diego issued in 2026. California had 10 flash flood warnings in September 2026, against 25 in an average September of 2008-2025 (California's flash flood warnings by year).
ExpiredWarning
In force for 3 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, San Diego CA
- Area
- Riverside and San Bernardino
- State
- California
- Level
- Warning
- Issued
- 4:32 p.m. PDT, September 24, 2026
- Expires
- 7:30 p.m. PDT, September 24, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KSGX FF.W 0009
- Official source
- National Weather Service: the notice at its source
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
FFWSGX The National Weather Service in San Diego has issued a * Flash Flood Warning for... Riverside County in southern California... San Bernardino County in southern California... * Until 730 PM PDT. * At 432 PM PDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 0.75 and 1.5 inches of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Yucaipa, Forest Falls, western Mount San Gorgonio, Banning, Mountain Home Village, Hwy 38 Between Yucaipa And Onyx Summit and Mentone.
What the agency told people to do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.