374
FGUS76 KSGX 152138
ESFSGX
HYDROLOGIC FORECAST FOR EXTREME SOUTHWESTERN CALIFORNIA
NATIONAL WEATHER SERVICE SAN DIEGO CA
238 PM PDT SAT AUG 15 2026
..FLASH FLOOD POTENTIAL INDEX FOR EXTREME SOUTHWESTERN CALIFORNIA
SYNOPSIS
THERE IS A 15-20% CHANCE OF AND THUNDERSTORMS OVER THE MOUNTAIN
RIDGES, DESERT SLOPES, AND INTO THE HIGH DESERT THIS AFTERNOON AND
A 10% CHANCE FOR SUNDAY AFTERNOON IN THE SAN BERNARDINO MOUNTAINS.
MAXIMUM RAINFALL RATES WILL BE AROUND 0.30 INCH PER HOUR,
LIMITING THE FLOODING THREAT. PRECIPITATION CHANCES LOWER TO LESS
THAN 5% FOR NEXT WEEK.
CAZ055-056-058-060-161345-
SAN BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
INCLUDING THE CITIES OF CRESTLINE, LAKE ARROWHEAD, BIG BEAR CITY,
BIG BEAR LAKE, RUNNING SPRINGS, WRIGHTWOOD, IDYLLWILD-PINE COVE,
JULIAN, PINE VALLEY, VICTORVILLE, HESPERIA, APPLE VALLEY,
AND LUCERNE VALLEY
238 PM PDT SAT AUG 15 2026
TONIGHT...LOW
THE RISK OF FLASH FLOODING IS MINIMAL.
SUNDAY...NONE
NO FLASH FLOODING IS EXPECTED.
MONDAY...NONE
NO FLASH FLOODING IS EXPECTED.
CAZ043-048-050-057-552-554-161345-
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
238 PM PDT SAT AUG 15 2026
TONIGHT...NONE
NO FLASH FLOODING IS EXPECTED.
SUNDAY...NONE
NO FLASH FLOODING IS EXPECTED.
MONDAY...NONE
NO FLASH FLOODING IS EXPECTED.
CAZ061-062-065-161345-
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
238 PM PDT SAT AUG 15 2026
TONIGHT...NONE
NO FLASH FLOODING IS EXPECTED.
SUNDAY...NONE
NO FLASH FLOODING IS EXPECTED.
MONDAY...NONE
NO FLASH FLOODING IS EXPECTED.
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