850
FGUS76 KSGX 072249
ESFSGX

Hydrologic Forecast for Extreme Southwestern California
National Weather Service San Diego CA
349 PM PDT Sun Sep 7 2025

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

.SYNOPSIS...
A few isolated thunderstorms may develop in the San Diego and
Riverside county mountains this afternoon. High resolution model
guidance is indicating rainfall rates from stronger thunderstorms
around 0.30-0.50 inches per hour this afternoon. Moisture will
rapidly decrease by Monday afternoon with dry conditions expected
through mid-late week.

$$

CAZ056-058-081315-
Riverside County Mountains-San Diego County Mountains-
Including the cities of Idyllwild-Pine Cove, Julian,
and Pine Valley
349 PM PDT Sun Sep 7 2025

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

$$

CAZ055-061-062-065-081315-
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
349 PM PDT Sun Sep 7 2025

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

$$

CAZ060-081315-
Apple and Lucerne Valleys-
Including the cities of Victorville, Hesperia, Apple Valley,
and Lucerne Valley
349 PM PDT Sun Sep 7 2025

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

$$

CAZ043-048-050-057-552-554-081315-
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
349 PM PDT Sun Sep 7 2025

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

$$