984
FGUS76 KSGX 040929
ESFSGX
HYDROLOGIC FORECAST FOR EXTREME SOUTHWESTERN CALIFORNIA
NATIONAL WEATHER SERVICE SAN DIEGO CA
229 AM PDT THU SEP 4 2025
..FLASH FLOOD POTENTIAL INDEX FOR EXTREME SOUTHWESTERN CALIFORNIA
SYNOPSIS
WHILE PRECIPITABLE WATER VALUES WEST OF THE MOUNTAINS HAVE FALLEN
SINCE TUESDAY, THERE ARE GREATER LOWER LEVEL MOISTURE AND
PRECIPITABLE WATER VALUES OVER THE LOWER DESERTS EXTENDING ONTO
THE DESERT SLOPES OF THE MOUNTAINS.
SCATTERED THUNDERSTORMS ARE EXPECTED AGAIN FOR THE MOUNTAINS AND
DESERTS FOR THIS AFTERNOON AND FRIDAY AFTERNOON WITH THE GREATER
COVERAGE OVER THE MOUNTAINS AND THE RELATIVELY GREATER RAINFALL
OVER THE MOUNTAINS FOR RIVERSIDE AND SAN DIEGO COUNTIES. HREF
90TH PERCENTILE HOURLY RAINFALL HAS PEAK HOURLY RAINFALL FOR THIS
AFTERNOON TO AROUND 1 INCH AND TO AROUND 0.75 INCH FOR FRIDAY
AFTERNOON. ISOLATED FLASH FLOODING IS POSSIBLE, MAINLY FOR THE
MOUNTAINS.
CAZ056-058-050215-
RIVERSIDE COUNTY MOUNTAINS-SAN DIEGO COUNTY MOUNTAINS-
INCLUDING THE CITIES OF IDYLLWILD-PINE COVE, JULIAN,
AND PINE VALLEY
229 AM PDT THU SEP 4 2025
TODAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
FRIDAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
CAZ055-060-050215-
SAN BERNARDINO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
INCLUDING THE CITIES OF CRESTLINE, LAKE ARROWHEAD, BIG BEAR CITY,
BIG BEAR LAKE, RUNNING SPRINGS, WRIGHTWOOD, VICTORVILLE,
HESPERIA, APPLE VALLEY, AND LUCERNE VALLEY
229 AM PDT THU SEP 4 2025
TODAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ061-062-065-050215-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
SAN GORGONIO PASS NEAR BANNING-
INCLUDING THE CITIES OF INDIO, PALM SPRINGS, CATHEDRAL CITY,
PALM DESERT, PALM DESERT COUNTRY, LA QUINTA, COACHELLA,
AND BORREGO SPRINGS
229 AM PDT THU SEP 4 2025
TODAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ048-050215-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
INCLUDING THE CITIES OF RIVERSIDE, SAN BERNARDINO, ONTARIO,
MORENO VALLEY, FONTANA, RANCHO CUCAMONGA, AND CORONA
229 AM PDT THU SEP 4 2025
TODAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ050-050215-
SAN DIEGO COUNTY VALLEYS-
INCLUDING THE CITIES OF ESCONDIDO, EL CAJON, SAN MARCOS, LA MESA,
SANTEE, AND POWAY
229 AM PDT THU SEP 4 2025
TODAY...NONE
NO FLASH FLOODING IS EXPECTED.
FRIDAY...NONE
NO FLASH FLOODING IS EXPECTED.
CAZ043-057-552-554-050215-
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
229 AM PDT THU SEP 4 2025
TODAY...NONE
NO FLASH FLOODING IS EXPECTED.
FRIDAY...NONE
NO FLASH FLOODING IS EXPECTED.
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