Flood Potential Outlook
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
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174 FGUS76 KSGX 081126 ESFSGX Hydrologic Forecast for Extreme Southwestern California National Weather Service San Diego CA 426 AM PDT Tue Sep 8 2026 ...Flash Flood Potential Index for Extreme Southwestern California... .SYNOPSIS... Mid and higher level tropical moisture will only slowly diminish through Friday with greater drying expected for next weekend. There is a slight chance of showers and thunderstorms, mainly for the mountains, with the greater chances for brief heavy rainfall each afternoon. The risk for flash flooding remains low. $$ CAZ055-056-058-065-090145- San Bernardino County Mountains-Riverside County Mountains- San Diego County Mountains-San Gorgonio Pass near Banning- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, Julian, and Pine Valley 426 AM PDT Tue Sep 8 2026 .TODAY...Low...the risk of flash flooding is minimal. .WEDNESDAY...Low...the risk of flash flooding is minimal. $$ CAZ060>062-090145- Apple and Lucerne Valleys-Coachella Valley- San Diego County Deserts- Including the cities of Victorville, Hesperia, Apple Valley, Lucerne Valley, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 426 AM PDT Tue Sep 8 2026 .TODAY...None...no flash flooding is expected. .WEDNESDAY...None...no flash flooding is expected. $$ CAZ048-050-090145- San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway 426 AM PDT Tue Sep 8 2026 .TODAY...None...no flash flooding is expected. .WEDNESDAY...None...no flash flooding is expected. $$ CAZ043-057-552-554-090145- San Diego County Coastal Areas-Santa Ana Mountains and Foothills- Orange County Coastal Areas-Orange County Inland Areas- Including the cities of Oceanside, Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 426 AM PDT Tue Sep 8 2026 .TODAY...None...no flash flooding is expected. .WEDNESDAY...None...no flash flooding is expected. $$ 17