354
WWUS76 KSGX 200913
NPWSGX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
213 AM PDT WED AUG 20 2025
CAZ060-202300-
/O.CON.KSGX.XH.W.0003.250820T1700Z-250824T0300Z/
APPLE AND LUCERNE VALLEYS-
INCLUDING THE CITIES OF HESPERIA, VICTORVILLE, LUCERNE VALLEY,
AND APPLE VALLEY
213 AM PDT WED AUG 20 2025
...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
8 PM PDT SATURDAY...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES UP TO 108
EXPECTED.
* WHERE...APPLE AND LUCERNE VALLEYS.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM PDT SATURDAY.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT EVENTS.
* ADDITIONAL DETAILS...THURSDAY AND FRIDAY ARE EXPECTED TO BE THE
HOTTEST DAYS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
CAZ061-062-065-202300-
/O.CON.KSGX.XH.W.0003.250820T1700Z-250824T0300Z/
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-SAN GORGONIO PASS NEAR
BANNING-
INCLUDING THE CITIES OF INDIO, COACHELLA, BORREGO SPRINGS,
CATHEDRAL CITY, LA QUINTA, PALM DESERT COUNTRY, PALM DESERT, AND
PALM SPRINGS
213 AM PDT WED AUG 20 2025
...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
8 PM PDT SATURDAY...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES UP TO 116
EXPECTED.
* WHERE...COACHELLA VALLEY, SAN DIEGO COUNTY DESERTS, AND SAN
GORGONIO PASS NEAR BANNING.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM PDT SATURDAY.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT EVENTS.
* ADDITIONAL DETAILS...THURSDAY AND FRIDAY ARE EXPECTED TO BE THE
HOTTEST DAYS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
CAZ048-202300-
/O.CON.KSGX.HT.Y.0005.250820T1700Z-250824T0300Z/
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
INCLUDING THE CITIES OF RANCHO CUCAMONGA, SAN BERNARDINO,
ONTARIO, RIVERSIDE, CORONA, FONTANA, AND MORENO VALLEY
213 AM PDT WED AUG 20 2025
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
PDT SATURDAY...
* WHAT...TEMPERATURES UP TO 107 EXPECTED.
* WHERE...SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND
EMPIRE.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM PDT SATURDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...THURSDAY AND FRIDAY ARE EXPECTED TO BE THE
HOTTEST DAYS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
CAZ050-202300-
/O.CON.KSGX.HT.Y.0005.250820T1700Z-250823T0300Z/
SAN DIEGO COUNTY VALLEYS-
INCLUDING THE CITIES OF POWAY, EL CAJON, ESCONDIDO, LA MESA, SAN
MARCOS, AND SANTEE
213 AM PDT WED AUG 20 2025
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
PDT FRIDAY...
* WHAT...TEMPERATURES UP TO 103 FOR THE INLAND VALLEYS ARE EXPECTED.
* WHERE...SAN DIEGO COUNTY VALLEYS.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...THURSDAY AND FRIDAY ARE EXPECTED TO BE THE
HOTTEST DAYS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
CAZ055-056-058-202300-
/O.CON.KSGX.HT.Y.0005.250820T1700Z-250823T0300Z/
SAN BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS-SAN
DIEGO COUNTY MOUNTAINS-
INCLUDING THE CITIES OF LAKE ARROWHEAD, IDYLLWILD-PINE COVE,
RUNNING SPRINGS, BIG BEAR CITY, CRESTLINE, WRIGHTWOOD, BIG BEAR
LAKE, PINE VALLEY, AND JULIAN
213 AM PDT WED AUG 20 2025
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
PDT FRIDAY...
* WHAT...TEMPERATURES IN THE 90S TO AROUND 100 BELOW 5500 FEET
ELEVATION EXPECTED.
* WHERE...RIVERSIDE COUNTY MOUNTAINS, SAN BERNARDINO COUNTY
MOUNTAINS, AND SAN DIEGO COUNTY MOUNTAINS.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...THURSDAY AND FRIDAY ARE EXPECTED TO BE THE
HOTTEST DAYS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
CAZ057-554-202300-
/O.CON.KSGX.HT.Y.0005.250821T1700Z-250823T0300Z/
SANTA ANA MOUNTAINS AND FOOTHILLS-ORANGE COUNTY INLAND AREAS-
INCLUDING THE CITIES OF MISSION VIEJO, ORANGE, SANTA ANA,
ANAHEIM, GARDEN GROVE, IRVINE, AND FULLERTON
213 AM PDT WED AUG 20 2025
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THURSDAY TO 8 PM PDT
FRIDAY...
* WHAT...TEMPERATURES UP TO 95 EXPECTED.
* WHERE...ORANGE COUNTY INLAND AREAS AND SANTA ANA MOUNTAINS AND
FOOTHILLS.
* WHEN...FROM 10 AM THURSDAY TO 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...THURSDAY AND FRIDAY ARE EXPECTED TO BE THE
HOTTEST DAYS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DRINK PLENTY OF FLUIDS, STAY IN AN AIR-CONDITIONED ROOM, STAY OUT OF
THE SUN, AND CHECK UP ON RELATIVES AND NEIGHBORS.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
17
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