051
FGUS76 KSGX 192258
ESFSGX

Hydrologic Forecast for Extreme Southwestern California
National Weather Service San Diego CA
358 PM PDT Tue Aug 19 2025

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

.SYNOPSIS...
Dry weather will continue through Wednesday. Monsoonal moisture
will increase for Thursday into the weekend with increasing
chances for afternoon and early evening thunderstorms for the
mountains and deserts and increasing flash flood potential for the
weekend. Precipitation chances are now below 15% on Thursday due
to limited instability, increasing to 25-50% for Friday through
the weekend.

$$

CAZ055-056-058-201315-
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
358 PM PDT Tue Aug 19 2025

.TONIGHT...None...no flash flooding is expected.
.WEDNESDAY...None...no flash flooding is expected.
.THURSDAY...None...no flash flooding is expected.

$$

CAZ060>062-065-201315-
Apple and Lucerne Valleys-Coachella Valley-
San Diego County Deserts-San Gorgonio Pass near Banning-
Including the cities of Victorville, Hesperia, Apple Valley,
Lucerne Valley, Indio, Palm Springs, Cathedral City, Palm Desert,
Palm Desert Country, La Quinta, Coachella, and Borrego Springs
358 PM PDT Tue Aug 19 2025

.TONIGHT...None...no flash flooding is expected.
.WEDNESDAY...None...no flash flooding is expected.
.THURSDAY...None...no flash flooding is expected.

$$

CAZ048-050-201315-
San Bernardino and Riverside County Valleys-The Inland Empire-
San Diego County Valleys-
Including the cities of Riverside, San Bernardino, Ontario,
Moreno Valley, Fontana, Rancho Cucamonga, Corona, Escondido,
El Cajon, San Marcos, La Mesa, Santee, and Poway
358 PM PDT Tue Aug 19 2025

.TONIGHT...None...no flash flooding is expected.
.WEDNESDAY...None...no flash flooding is expected.
.THURSDAY...None...no flash flooding is expected.

$$

CAZ043-057-552-554-201315-
San Diego County Coastal Areas-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, Huntington Beach,
Costa Mesa, Newport Beach, Laguna Beach, San Clemente, Santa Ana,
Anaheim, Garden Grove, Irvine, Orange, Fullerton,
and Mission Viejo
358 PM PDT Tue Aug 19 2025

.TONIGHT...None...no flash flooding is expected.
.WEDNESDAY...None...no flash flooding is expected.
.THURSDAY...None...no flash flooding is expected.

$$