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FGUS76 KSGX 200900
ESFSGX

Hydrologic Forecast for Extreme Southwestern California
National Weather Service San Diego CA
200 AM PDT Wed Aug 20 2025

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

.SYNOPSIS...
Dry weather will continue today and most likely through Thursday
with chances for measurable rainfall of less than 15 percent on
Thursday. Monsoonal moisture will begin to increase on Thursday
and continue into the weekend. Chances for mainly afternoon and
early evening showers and thunderstorms, mainly for the mountains
and deserts, will increase on Friday into the weekend and
continue into early next week. Daily chances for measurable
rainfall at Big Bear exceed 50 percent each day for Friday
through Monday, but with daily chances for one-half inch of
rainfall each day below 20 percent.

$$

CAZ055-056-058-210230-
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
200 AM PDT Wed Aug 20 2025

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

$$

CAZ060>062-065-210230-
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
200 AM PDT Wed Aug 20 2025

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

$$

CAZ048-050-210230-
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
200 AM PDT Wed Aug 20 2025

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

$$

CAZ043-057-552-554-210230-
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
200 AM PDT Wed Aug 20 2025

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

$$

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