####018002827#### FGUS76 KSGX 182138 ESFSGX Hydrologic Forecast for Extreme Southwestern California National Weather Service San Diego CA 238 PM PDT Fri Jul 18 2025 ...Flash Flood Potential Index for Extreme Southwestern California... .SYNOPSIS... Multiple thunderstorms with areas of flash flooding have developed this afternoon, mainly confined to the San Bernardino County mountains and into the High Desert. A few isolated thunderstorms have developed in the Riverside mountains, with no reports of flooding so far. Thunderstorms and flooding threat will diminish by 8 PM. For Saturday, there will be sufficient remaining moisture for thunderstorm development over the San Bernardino Mountains, High Desert, and Riverside County mountains during the afternoon with the potential for isolated brief heavier rainfall. $$ CAZ056-058-191315- Riverside County Mountains-San Diego County Mountains- Including the cities of Idyllwild-Pine Cove, Julian, and Pine Valley 238 PM PDT Fri Jul 18 2025 .TONIGHT...Low...the risk of flash flooding is minimal. .SATURDAY...Low...the risk of flash flooding is minimal. .SUNDAY...None...no flash flooding is expected. $$ CAZ055-060-191315- 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 238 PM PDT Fri Jul 18 2025 .TONIGHT...Moderate...thunderstorms are expected to develop and isolated flash flooding is possible. .SATURDAY...Low...the risk of flash flooding is minimal. .SUNDAY...None...no flash flooding is expected. $$ CAZ043-048-050-057-061-062-065-552-554-191315- San Diego County Coastal Areas- San Bernardino and Riverside County Valleys-The Inland Empire- San Diego County Valleys-Santa Ana Mountains and Foothills- Coachella Valley-San Diego County Deserts- San Gorgonio Pass near Banning-Orange County Coastal Areas- Orange County Inland Areas- Including the cities of Oceanside, Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, Riverside, San Bernardino, Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway, Indio, Palm Springs, Cathedral City, Palm Desert, Palm Desert Country, La Quinta, Coachella, Borrego Springs, Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach, San Clemente, Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo 238 PM PDT Fri Jul 18 2025 .TONIGHT...None...no flash flooding is expected. .SATURDAY...None...no flash flooding is expected. .SUNDAY...None...no flash flooding is expected. $$ CO