805
FGUS76 KSGX 032245
ESFSGX
HYDROLOGIC FORECAST FOR EXTREME SOUTHWESTERN CALIFORNIA
NATIONAL WEATHER SERVICE SAN DIEGO CA
345 PM PDT WED SEP 3 2025
..FLASH FLOOD POTENTIAL INDEX FOR EXTREME SOUTHWESTERN CALIFORNIA
SYNOPSIS
MONSOONAL MOISTURE WILL REMAIN IN PLACE THROUGH THURSDAY WITH
CHANCES FOR THUNDERSTORMS DURING THE AFTERNOON AND EARLY EVENING
IN THE MOUNTAINS, DESERTS, AND INLAND VALLEYS. ISOLATED FLASH
FLOODING IS POSSIBLE, MAINLY FOR THE MOUNTAINS. PEAK HOURLY
RAINFALL OF 0.25 TO 0.50 INCH IS POSSIBLE FOR THIS AFTERNOON WITH
ISOLATED HOURLY RAINFALL ON THURSDAY AFTERNOON OF UP TO AROUND
ONE INCH.
CAZ055-041315-
SAN BERNARDINO COUNTY MOUNTAINS-
INCLUDING THE CITIES OF CRESTLINE, LAKE ARROWHEAD, BIG BEAR CITY,
BIG BEAR LAKE, RUNNING SPRINGS, AND WRIGHTWOOD
345 PM PDT WED SEP 3 2025
TONIGHT...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
THURSDAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ056-058-041315-
RIVERSIDE COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS-
INCLUDING THE CITIES OF IDYLLWILD-PINE COVE, JULIAN,
AND PINE VALLEY
345 PM PDT WED SEP 3 2025
TONIGHT...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
THURSDAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ060>062-065-041315-
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
345 PM PDT WED SEP 3 2025
TONIGHT...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
THURSDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ043-048-050-057-552-554-041315-
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
345 PM PDT WED SEP 3 2025
TONIGHT...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
THURSDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
FRIDAY...NONE
NO FLASH FLOODING IS EXPECTED.
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