408
WWUS76 KSGX 210945
NPWSGX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
245 AM PDT THU AUG 21 2025
CAZ060-212230-
/O.CON.KSGX.XH.W.0003.000000T0000Z-250824T0300Z/
APPLE AND LUCERNE VALLEYS-
INCLUDING THE CITIES OF APPLE VALLEY, HESPERIA, LUCERNE VALLEY,
AND VICTORVILLE
245 AM PDT THU AUG 21 2025
..EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT SATURDAY
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES UP TO 108.
* WHERE...APPLE AND LUCERNE VALLEYS.
* WHEN...UNTIL 8 PM PDT SATURDAY.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT EVENTS.
* ADDITIONAL DETAILS...TODAY 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.
CAZ061-062-065-212230-
/O.CON.KSGX.XH.W.0003.000000T0000Z-250824T0300Z/
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-SAN GORGONIO PASS NEAR
BANNING-
INCLUDING THE CITIES OF CATHEDRAL CITY, INDIO, BORREGO SPRINGS,
COACHELLA, PALM SPRINGS, PALM DESERT, LA QUINTA, AND PALM DESERT
COUNTRY
245 AM PDT THU AUG 21 2025
..EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT SATURDAY
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES UP TO 116.
* WHERE...COACHELLA VALLEY, SAN DIEGO COUNTY DESERTS, AND SAN
GORGONIO PASS NEAR BANNING.
* WHEN...UNTIL 8 PM PDT SATURDAY.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT EVENTS.
* ADDITIONAL DETAILS...TODAY 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.
CAZ048-212230-
/O.CON.KSGX.HT.Y.0005.000000T0000Z-250824T0300Z/
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
INCLUDING THE CITIES OF RANCHO CUCAMONGA, SAN BERNARDINO,
RIVERSIDE, FONTANA, ONTARIO, CORONA, AND MORENO VALLEY
245 AM PDT THU AUG 21 2025
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT SATURDAY
* WHAT...TEMPERATURES UP TO 108 EXPECTED.
* WHERE...SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND
EMPIRE.
* WHEN...UNTIL 8 PM PDT SATURDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...TODAY 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.
CAZ050-212230-
/O.CON.KSGX.HT.Y.0005.000000T0000Z-250823T0300Z/
SAN DIEGO COUNTY VALLEYS-
INCLUDING THE CITIES OF POWAY, SAN MARCOS, SANTEE, ESCONDIDO, EL
CAJON, AND LA MESA
245 AM PDT THU AUG 21 2025
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY
* WHAT...TEMPERATURES UP TO 104 FOR THE INLAND VALLEYS EXPECTED.
* WHERE...SAN DIEGO COUNTY VALLEYS.
* WHEN...UNTIL 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
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.
CAZ055-056-058-212230-
/O.CON.KSGX.HT.Y.0005.000000T0000Z-250823T0300Z/
SAN BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS-SAN
DIEGO COUNTY MOUNTAINS-
INCLUDING THE CITIES OF BIG BEAR CITY, PINE VALLEY, JULIAN,
CRESTLINE, RUNNING SPRINGS, LAKE ARROWHEAD, IDYLLWILD-PINE COVE,
BIG BEAR LAKE, AND WRIGHTWOOD
245 AM PDT THU AUG 21 2025
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM PDT FRIDAY
* WHAT...TEMPERATURES UP TO 102 FOR ELEVATIONS BELOW 5500 FEET
EXPECTED.
* WHERE...RIVERSIDE COUNTY MOUNTAINS, SAN BERNARDINO COUNTY
MOUNTAINS, AND SAN DIEGO COUNTY MOUNTAINS.
* WHEN...UNTIL 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
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.
CAZ057-554-212230-
/O.CON.KSGX.HT.Y.0005.250821T1700Z-250823T0300Z/
SANTA ANA MOUNTAINS AND FOOTHILLS-ORANGE COUNTY INLAND AREAS-
INCLUDING THE CITIES OF ANAHEIM, FULLERTON, IRVINE, ORANGE, SANTA
ANA, MISSION VIEJO, AND GARDEN GROVE
245 AM PDT THU AUG 21 2025
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM
PDT FRIDAY...
* WHAT...TEMPERATURES UP TO 96 EXPECTED.
* WHERE...ORANGE COUNTY INLAND AREAS AND SANTA ANA MOUNTAINS AND
FOOTHILLS.
* WHEN...FROM 10 AM THIS MORNING TO 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
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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