908
FGUS76 KSGX 062237
ESFSGX

Hydrologic Forecast for Extreme Southwestern California
National Weather Service San Diego CA
337 PM PDT Sat Sep 6 2025

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

.SYNOPSIS...
A few isolated thunderstorms may develop in the San Diego and
Riverside county mountains Sunday. Precipitable water values are
expected to increase slightly for Sunday, but it won`t be enough
of a surge to create a significant threat of flash flooding. High
resolution model guidance is indicating rainfall rates around 0.30
inches per hour Sunday afternoon. Moisture will continue to
decrease into early next week with dry conditions expected.

$$

CAZ056-058-071330-
Riverside County Mountains-San Diego County Mountains-
Including the cities of Idyllwild-Pine Cove, Julian,
and Pine Valley
337 PM PDT Sat Sep 6 2025

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

$$

CAZ055-061-062-065-071330-
San Bernardino County Mountains-Coachella Valley-
San Diego County Deserts-San Gorgonio Pass near Banning-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, Wrightwood, Indio, Palm Springs,
Cathedral City, Palm Desert, Palm Desert Country, La Quinta,
Coachella, and Borrego Springs
337 PM PDT Sat Sep 6 2025

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

$$

CAZ060-071330-
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, Apple Valley,
and Lucerne Valley
337 PM PDT Sat Sep 6 2025

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

$$

CAZ043-048-050-057-552-554-071330-
San Diego County Coastal Areas-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-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, Riverside, San Bernardino,
Ontario, Moreno Valley, Fontana, Rancho Cucamonga, Corona,
Escondido, El Cajon, San Marcos, La Mesa, Santee, Poway,
Huntington Beach, Costa Mesa, Newport Beach, Laguna Beach,
San Clemente, Santa Ana, Anaheim, Garden Grove, Irvine, Orange,
Fullerton, and Mission Viejo
337 PM PDT Sat Sep 6 2025

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

$$