398
WGUS66 KSGX 220501
FFASGX
FLOOD WATCH
NATIONAL WEATHER SERVICE SAN DIEGO CA
901 PM PST SUN DEC 21 2025
CAZ048-055>057-060-061-065-552-554-221415-
/O.CON.KSGX.FA.A.0006.251224T0000Z-251225T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-SAN
BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS-SANTA ANA
MOUNTAINS AND FOOTHILLS-APPLE AND LUCERNE VALLEYS-COACHELLA
VALLEY-SAN GORGONIO PASS NEAR BANNING-ORANGE COUNTY COASTAL AREAS-
ORANGE COUNTY INLAND AREAS-
INCLUDING THE CITIES OF IRVINE, MISSION VIEJO, LUCERNE VALLEY,
NEWPORT BEACH, BIG BEAR CITY, SAN BERNARDINO, LAGUNA BEACH, BIG
BEAR LAKE, RANCHO CUCAMONGA, VICTORVILLE, PALM DESERT, CORONA,
COACHELLA, APPLE VALLEY, IDYLLWILD-PINE COVE, FULLERTON,
HUNTINGTON BEACH, PALM DESERT COUNTRY, ANAHEIM, LA QUINTA, INDIO,
CRESTLINE, ONTARIO, RIVERSIDE, WRIGHTWOOD, RUNNING SPRINGS, COSTA
MESA, MORENO VALLEY, SAN CLEMENTE, SANTA ANA, GARDEN GROVE,
CATHEDRAL CITY, PALM SPRINGS, LAKE ARROWHEAD, ORANGE, HESPERIA,
AND FONTANA
901 PM PST SUN DEC 21 2025
...FLOOD WATCH REMAINS IN EFFECT FROM TUESDAY AFTERNOON THROUGH
WEDNESDAY EVENING...
* WHAT...FLOODING CAUSED BY EXCESSIVE RAINFALL CONTINUES TO BE
POSSIBLE.
* WHERE...A PORTION OF SOUTHWEST CALIFORNIA, INCLUDING THE FOLLOWING
AREAS, APPLE AND LUCERNE VALLEYS, COACHELLA VALLEY, ORANGE COUNTY
COASTAL AREAS, ORANGE COUNTY INLAND AREAS, RIVERSIDE COUNTY
MOUNTAINS, SAN BERNARDINO COUNTY MOUNTAINS, SAN BERNARDINO AND
RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE, SAN GORGONIO PASS NEAR
BANNING AND SANTA ANA MOUNTAINS AND FOOTHILLS.
* WHEN...FROM TUESDAY AFTERNOON THROUGH WEDNESDAY EVENING.
* IMPACTS...EXCESSIVE RUNOFF MAY RESULT IN FLOODING OF RIVERS,
CREEKS, STREAMS, AND OTHER LOW-LYING AND FLOOD-PRONE LOCATIONS.
MUD AND DEBRIS FLOW ARE POSSIBLE NEAR AND IN BURN SCARS, INCLUDING
THE AIRPORT, BRIDGE AND LINE BURN SCARS.
* ADDITIONAL DETAILS...
- AN ATMOSPHERIC RIVER WILL LIKELY BRING WIDESPREAD MODERATE TO
HEAVY RAIN TO THE REGION LATE TUESDAY THROUGH WEDNESDAY.
SHOWERS COULD BEGIN TO DEVELOP AS EARLY AS TUESDAY EVENING,
ESPECIALLY IN THE MOUNTAINS. HEAVIEST AND MOST WIDESPREAD
RAIN IS EXPECTED WEDNESDAY MORNING CONTINUING THROUGH THE
AFTERNOON IN THE COACHELLA VALLEY AND IN THE MOUNTAINS. PEAK
RAINFALL RATES OF 0.50 TO 1 INCH PER HOUR ARE EXPECTED. THERE
IS A POTENTIAL FOR LOCALLY HEAVIER HOURLY RAINFALL RATES TO
DEVELOP WITH CONVECTION EMBEDDED IN THE MAIN RAIN BAND OR IN
THUNDERSTORMS AFTER THE MAIN BAND PASSES. SCATTERED LOCALLY
HEAVY SHOWERS COULD CONTINUE INTO THURSDAY BUT IMPACTS FROM
ANY ADDITIONAL RAIN ARE EXPECTED TO BE MORE LOCALIZED.
-SNOW LEVELS ARE EXPECTED TO REMAIN ABOVE 8000 FT DURING
PERIOD OF HEAVIEST PRECIPITATION BRINGING A HEIGHTENED RISK
OF MUD SLIDES, DEBRIS FLOW, AND AREAS OF FLASH FLOODING IN
THE SAN BERNARDINO COUNTY MOUNTAINS.
- HTTPS://WWW.WEATHER.GOV/SAFETY/FLOOD
PRECAUTIONARY/PREPAREDNESS ACTIONS...
YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD
WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED
TO TAKE ACTION SHOULD FLOODING DEVELOP.
CAZ043-050-058-062-221415-
/O.CON.KSGX.FA.A.0006.251224T1200Z-251225T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAN DIEGO COUNTY COASTAL AREAS-SAN DIEGO COUNTY VALLEYS-SAN DIEGO
COUNTY MOUNTAINS-SAN DIEGO COUNTY DESERTS-
INCLUDING THE CITIES OF ENCINITAS, ESCONDIDO, SAN DIEGO, LA MESA,
CARLSBAD, SANTEE, EL CAJON, OCEANSIDE, VISTA, BORREGO SPRINGS,
POWAY, PINE VALLEY, CHULA VISTA, JULIAN, NATIONAL CITY, AND SAN
MARCOS
901 PM PST SUN DEC 21 2025
...FLOOD WATCH REMAINS IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
LATE WEDNESDAY NIGHT...
* WHAT...FLOODING CAUSED BY EXCESSIVE RAINFALL CONTINUES TO BE
POSSIBLE.
* WHERE...A PORTION OF SOUTHWEST CALIFORNIA, INCLUDING THE FOLLOWING
AREAS, SAN DIEGO COUNTY COASTAL AREAS, SAN DIEGO COUNTY DESERTS,
SAN DIEGO COUNTY MOUNTAINS AND SAN DIEGO COUNTY VALLEYS.
* WHEN...FROM LATE TUESDAY NIGHT THROUGH LATE WEDNESDAY NIGHT.
* IMPACTS...EXCESSIVE RUNOFF MAY RESULT IN FLOODING OF RIVERS,
CREEKS, STREAMS, AND OTHER LOW-LYING AND FLOOD-PRONE LOCATIONS.
* ADDITIONAL DETAILS...
- AN ATMOSPHERIC RIVER WILL LIKELY BRING WIDESPREAD MODERATE TO
HEAVY RAIN TO THE AREA WEDNESDAY. HEAVIEST MOST WIDESPREAD
RAIN IS EXPECTED LATE WEDNESDAY MORNING CONTINUING THROUGH
THE EVENING FOR THE MOUNTAINS AND DESERTS. PEAK RAINFALL
RATES OF 0.50 TO 1 INCH PER HOUR ARE EXPECTED. SCATTERED
LOCALLY HEAVY SHOWERS COULD CONTINUE INTO THURSDAY BUT
IMPACTS FROM ANY ADDITIONAL RAIN ARE EXPECTED TO BE MORE
LOCALIZED.
- HTTPS://WWW.WEATHER.GOV/SAFETY/FLOOD
PRECAUTIONARY/PREPAREDNESS ACTIONS...
YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD
WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED
TO TAKE ACTION SHOULD FLOODING DEVELOP.
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