490
FGUS76 KSGX 280950
ESFSGX

Hydrologic Forecast for Extreme Southwestern California
National Weather Service San Diego CA
250 AM PDT Thu Aug 28 2025

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

.SYNOPSIS...
Increasing moisture from the remnants of Tropical Storm Juliette
with scattered showers will spread northward across portions of
southwestern California today. There is a slight chance of
thunderstorms for this afternoon. If there are enough breaks in
the overcast, thunderstorms capable of producing isolated flash
flooding could occur over the Riverside County mountains and San
Bernardino Mountains. Drying will occur for tonight and Friday
with isolated showers possible near the San Bernardino Mountains
on Friday afternoon.

$$

CAZ055-056-290145-
San Bernardino County Mountains-Riverside County Mountains-
Including the cities of Crestline, Lake Arrowhead, Big Bear City,
Big Bear Lake, Running Springs, Wrightwood,
and Idyllwild-Pine Cove
250 AM PDT Thu Aug 28 2025

.TODAY...Moderate...thunderstorms are expected to develop and
isolated flash flooding is possible.
.FRIDAY...Low...the risk of flash flooding is minimal.

$$

CAZ058-060>062-065-290145-
San Diego County Mountains-Apple and Lucerne Valleys-
Coachella Valley-San Diego County Deserts-
San Gorgonio Pass near Banning-
Including the cities of Julian, Pine Valley, Victorville,
Hesperia, Apple Valley, Lucerne Valley, Indio, Palm Springs,
Cathedral City, Palm Desert, Palm Desert Country, La Quinta,
Coachella, and Borrego Springs
250 AM PDT Thu Aug 28 2025

.TODAY...Low...the risk of flash flooding is minimal.
.FRIDAY...None...no flash flooding is expected.

$$

CAZ048-050-290145-
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
250 AM PDT Thu Aug 28 2025

.TODAY...Low...the risk of flash flooding is minimal.
.FRIDAY...None...no flash flooding is expected.

$$

CAZ043-057-552-554-290145-
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
250 AM PDT Thu Aug 28 2025

.TODAY...Low...the risk of flash flooding is minimal.
.FRIDAY...None...no flash flooding is expected.

$$

17