FGUS76 KSGX 222227
ESFSGX

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

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

.SYNOPSIS...
A shower or two may briefly move north near the Mexico border, but
no flash flooding is expected. Dry weather follows for Sunday. A slight
chance of showers and thunderstorms in the mountains on Monday
with a low risk of flash flooding.

$$

CAZ055-056-058-231315-
San Bernardino County Mountains-Riverside County Mountains-
San Diego County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City, 
Big Bear Lake, Running Springs, Wrightwood, Idyllwild-Pine Cove, 
Julian, and Pine Valley
327 PM PDT Sat Aug 22 2026

.TONIGHT...None...no flash flooding is expected. 
.SUNDAY...None...no flash flooding is expected. 
.MONDAY...Low...the risk of flash flooding is minimal. 

$$

CAZ043-048-050-057-060>062-065-552-554-231315-
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-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, 
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
327 PM PDT Sat Aug 22 2026

.TONIGHT...None...no flash flooding is expected. 
.SUNDAY...None...no flash flooding is expected. 
.MONDAY...None...no flash flooding is expected. 

$$