FGUS76 KSGX 220907
ESFSGX

Hydrologic Forecast for Extreme Southwestern California
National Weather Service San Diego CA
207 AM PDT Sat Aug 22 2026

...Flash Flood Potential Index for Extreme Southwestern California...

.SYNOPSIS...
Monsoonal moisture will decrease this weekend, with a slight chance
of showers and thunderstorms in the mountains and low desert
returning Monday afternoon. No flash flooding is expected 
today and Sunday.

$$

CAZ058-230145-
San Diego County Mountains-
Including the cities of Julian and Pine Valley
207 AM PDT Sat Aug 22 2026

.TODAY...None...no flash flooding is expected. 
.SUNDAY...None...no flash flooding is expected. 

$$

CAZ043-048-050-055>057-060>062-065-552-554-230145-
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-San Bernardino County Mountains-
Riverside County Mountains-Santa Ana Mountains and Foothills-
Apple and Lucerne Valleys-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, 
Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, 
Running Springs, Wrightwood, Idyllwild-Pine Cove, Victorville, 
Hesperia, Apple Valley, Lucerne Valley, 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
207 AM PDT Sat Aug 22 2026

.TODAY...None...no flash flooding is expected. 
.SUNDAY...None...no flash flooding is expected. 

$$