865
FGUS76 KSGX 180920
ESFSGX
HYDROLOGIC FORECAST FOR EXTREME SOUTHWESTERN CALIFORNIA
NATIONAL WEATHER SERVICE SAN DIEGO CA
220 AM PDT THU SEP 18 2025
..FLASH FLOOD POTENTIAL INDEX FOR EXTREME SOUTHWESTERN CALIFORNIA
SYNOPSIS
MOISTURE FROM THE REMNANTS WILL PEAK TODAY, THEN DECREASE INTO THE
WEEKEND. SHOWERS AND SCATTERED THUNDERSTORMS WILL MOVE NORTHWARD
ACROSS THE AREA TODAY WITH THE MOUNTAINS AND DESERTS THE MOST
LIKELY LOCATIONS FOR HEAVIER RAINFALL WITH THE MOST LIKELY TIME
FOR THE HEAVIER RAINFALL FROM LATE MORNING THROUGH EARLY EVENING.
BANDS OF THUNDERSTORMS TRACKING ACROSS THE SAME AREA WOULD BE THE
MOST LIKELY SCENARIO FOR PRODUCING HEAVIER RAINFALL TOTALS. THE
MOST LIKELY PEAK HOURLY RAINFALL IS ONE-HALF TO ONE INCH WITH
ISOLATED MAXIMUM HOURLY RAINFALL TO 2 INCHES.
CAZ055-060-190145-
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
220 AM PDT THU SEP 18 2025
TODAY...HIGH
THUNDERSTORMS WITH AREAS OF HEAVY RAIN ARE
EXPECTED AND THE THREAT OF FLASH FLOODING IS SIGNIFICANT.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ056-190145-
RIVERSIDE COUNTY MOUNTAINS-
INCLUDING THE CITY OF IDYLLWILD-PINE COVE
220 AM PDT THU SEP 18 2025
TODAY...HIGH
THUNDERSTORMS WITH AREAS OF HEAVY RAIN ARE
EXPECTED AND THE THREAT OF FLASH FLOODING IS SIGNIFICANT.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ058-190145-
SAN DIEGO COUNTY MOUNTAINS-
INCLUDING THE CITIES OF JULIAN AND PINE VALLEY
220 AM PDT THU SEP 18 2025
TODAY...HIGH
THUNDERSTORMS WITH AREAS OF HEAVY RAIN ARE
EXPECTED AND THE THREAT OF FLASH FLOODING IS SIGNIFICANT.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ061-062-065-190145-
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
220 AM PDT THU SEP 18 2025
TODAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ048-190145-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
INCLUDING THE CITIES OF RIVERSIDE, SAN BERNARDINO, ONTARIO,
MORENO VALLEY, FONTANA, RANCHO CUCAMONGA, AND CORONA
220 AM PDT THU SEP 18 2025
TODAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
FRIDAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
CAZ050-190145-
SAN DIEGO COUNTY VALLEYS-
INCLUDING THE CITIES OF ESCONDIDO, EL CAJON, SAN MARCOS, LA MESA,
SANTEE, AND POWAY
220 AM PDT THU SEP 18 2025
TODAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
FRIDAY...NONE
NO FLASH FLOODING IS EXPECTED.
CAZ057-554-190145-
SANTA ANA MOUNTAINS AND FOOTHILLS-ORANGE COUNTY INLAND AREAS-
INCLUDING THE CITIES OF SANTA ANA, ANAHEIM, GARDEN GROVE, IRVINE,
ORANGE, FULLERTON, AND MISSION VIEJO
220 AM PDT THU SEP 18 2025
TODAY...MODERATE
THUNDERSTORMS ARE EXPECTED TO DEVELOP AND
ISOLATED FLASH FLOODING IS POSSIBLE.
FRIDAY...NONE
NO FLASH FLOODING IS EXPECTED.
CAZ043-552-190145-
SAN DIEGO COUNTY COASTAL AREAS-ORANGE COUNTY COASTAL AREAS-
INCLUDING THE CITIES OF OCEANSIDE, VISTA, CARLSBAD, ENCINITAS,
CHULA VISTA, NATIONAL CITY, SAN DIEGO, HUNTINGTON BEACH,
COSTA MESA, NEWPORT BEACH, LAGUNA BEACH, AND SAN CLEMENTE
220 AM PDT THU SEP 18 2025
TODAY...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
FRIDAY...NONE
NO FLASH FLOODING IS EXPECTED.
17
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