####018003163#### FGUS76 KSGX 260936 ESFSGX Hydrologic Forecast for Extreme Southwestern California National Weather Service San Diego CA 236 AM PDT Tue Aug 26 2025 ...Flash Flood Potential Index for Extreme Southwestern California... .SYNOPSIS... Greater monsoonal moisture will remain in place today with some drying on Wednesday. Thunderstorms are expected for this afternoon and early evening, mainly for the mountains and deserts, with isolated rainfall rates of 0.50-0.75 inch per hour over the mountains. Decreasing thunderstorm coverage and rainfall amounts are expected on Wednesday afternoon and early evening. $$ CAZ055-060-270200- San Bernardino County Mountains-Apple and Lucerne Valleys- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, Victorville, Hesperia, Apple Valley, and Lucerne Valley 236 AM PDT Tue Aug 26 2025 .TODAY...Moderate...thunderstorms are expected to develop and isolated flash flooding is possible. .WEDNESDAY...Low...the risk of flash flooding is minimal. $$ CAZ056-058-270200- Riverside County Mountains-San Diego County Mountains- Including the cities of Idyllwild-Pine Cove, Julian, and Pine Valley 236 AM PDT Tue Aug 26 2025 .TODAY...Moderate...thunderstorms are expected to develop and isolated flash flooding is possible. .WEDNESDAY...Low...the risk of flash flooding is minimal. $$ CAZ061-062-065-270200- Coachella Valley-San Diego County Deserts- San Gorgonio Pass near Banning- Including the cities of Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, and Borrego Springs 236 AM PDT Tue Aug 26 2025 .TODAY...Moderate...thunderstorms are expected to develop and isolated flash flooding is possible. .WEDNESDAY...Low...the risk of flash flooding is minimal. $$ CAZ048-270200- San Bernardino and Riverside County Valleys-The Inland Empire- Including the cities of Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, and Corona 236 AM PDT Tue Aug 26 2025 .TODAY...Low...the risk of flash flooding is minimal. .WEDNESDAY...Low...the risk of flash flooding is minimal. $$ CAZ050-270200- San Diego County Valleys- Including the cities of Escondido, El Cajon, San Marcos, La Mesa, Santee, and Poway 236 AM PDT Tue Aug 26 2025 .TODAY...Low...the risk of flash flooding is minimal. .WEDNESDAY...None...no flash flooding is expected. $$ CAZ043-057-552-554-270200- 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 236 AM PDT Tue Aug 26 2025 .TODAY...None...no flash flooding is expected. .WEDNESDAY...None...no flash flooding is expected. $$ 17