698
WWUS76 KSGX 191928
NPWSGX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SAN DIEGO CA
1228 PM PDT TUE AUG 19 2025
CAZ060-200500-
/O.UPG.KSGX.XH.A.0002.250821T1700Z-250824T0300Z/
/O.NEW.KSGX.XH.W.0003.250820T1700Z-250824T0300Z/
APPLE AND LUCERNE VALLEYS-
INCLUDING THE CITIES OF VICTORVILLE, APPLE VALLEY, HESPERIA, AND
LUCERNE VALLEY
1228 PM PDT TUE AUG 19 2025
...EXTREME HEAT WARNING IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT
SATURDAY...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES 100 TO 107
POSSIBLE.
* WHERE...APPLE AND LUCERNE VALLEYS.
* WHEN...FROM 10 AM WEDNESDAY 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.
CAZ061-062-065-200500-
/O.UPG.KSGX.XH.A.0002.250821T1700Z-250824T0300Z/
/O.NEW.KSGX.XH.W.0003.250820T1700Z-250824T0300Z/
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-SAN GORGONIO PASS NEAR
BANNING-
INCLUDING THE CITIES OF INDIO, PALM SPRINGS, LA QUINTA, BORREGO
SPRINGS, COACHELLA, PALM DESERT, PALM DESERT COUNTRY, AND
CATHEDRAL CITY
1228 PM PDT TUE AUG 19 2025
...EXTREME HEAT WARNING IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT
SATURDAY...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES 110 TO 116
POSSIBLE.
* WHERE...COACHELLA VALLEY, SAN DIEGO COUNTY DESERTS, AND SAN
GORGONIO PASS NEAR BANNING.
* WHEN...FROM 10 AM WEDNESDAY 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.
CAZ048-200500-
/O.UPG.KSGX.XH.A.0002.250821T1700Z-250824T0300Z/
/O.NEW.KSGX.HT.Y.0005.250820T1700Z-250824T0300Z/
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
INCLUDING THE CITIES OF ONTARIO, FONTANA, RANCHO CUCAMONGA,
CORONA, SAN BERNARDINO, RIVERSIDE, AND MORENO VALLEY
1228 PM PDT TUE AUG 19 2025
...HEAT ADVISORY IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT
SATURDAY...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES UP TO 105
POSSIBLE.
* WHERE...SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND
EMPIRE.
* WHEN...FROM 10 AM WEDNESDAY 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.
CAZ050-200500-
/O.UPG.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
/O.NEW.KSGX.HT.Y.0005.250820T1700Z-250823T0300Z/
SAN DIEGO COUNTY VALLEYS-
INCLUDING THE CITIES OF SANTEE, EL CAJON, POWAY, LA MESA, SAN
MARCOS, AND ESCONDIDO
1228 PM PDT TUE AUG 19 2025
..HEAT ADVISORY IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT FRIDAY
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES IN THE MID 90S
UP TO 102 FOR THE INLAND VALLEYS POSSIBLE.
* WHERE...SAN DIEGO COUNTY VALLEYS.
* WHEN...FROM 10 AM WEDNESDAY TO 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...THE HOTTEST TEMPERATURES ARE EXPECTED FOR THE
INLAND VALLEYS NEAR THE COASTAL FOOTHILLS OF THE MOUNTAINS.
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.
CAZ055-056-058-200500-
/O.UPG.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
/O.NEW.KSGX.HT.Y.0005.250820T1700Z-250823T0300Z/
SAN BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS-SAN
DIEGO COUNTY MOUNTAINS-
INCLUDING THE CITIES OF BIG BEAR CITY, RUNNING SPRINGS, JULIAN,
LAKE ARROWHEAD, CRESTLINE, WRIGHTWOOD, IDYLLWILD-PINE COVE, PINE
VALLEY, AND BIG BEAR LAKE
1228 PM PDT TUE AUG 19 2025
..HEAT ADVISORY IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT FRIDAY
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES IN THE 90S TO
AROUND 100 BELOW 5500 FEET POSSIBLE.
* WHERE...RIVERSIDE COUNTY MOUNTAINS, SAN BERNARDINO COUNTY
MOUNTAINS, AND SAN DIEGO COUNTY MOUNTAINS.
* WHEN...FROM 10 AM WEDNESDAY TO 8 PM PDT FRIDAY.
* IMPACTS...HOT TEMPERATURES MAY CAUSE HEAT ILLNESSES.
* ADDITIONAL DETAILS...ABOVE AVERAGE TEMPERATURES OVERNIGHT WILL
LIMIT OVERNIGHT RELIEF FROM THE HEAT. WIDESPREAD MODERATE TO
LOCALLY MAJOR HEATRISK.
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.
CAZ057-554-200500-
/O.UPG.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
/O.NEW.KSGX.HT.Y.0005.250821T1700Z-250823T0300Z/
SANTA ANA MOUNTAINS AND FOOTHILLS-ORANGE COUNTY INLAND AREAS-
INCLUDING THE CITIES OF ANAHEIM, FULLERTON, MISSION VIEJO,
IRVINE, GARDEN GROVE, ORANGE, AND SANTA ANA
1228 PM PDT TUE AUG 19 2025
..HEAT ADVISORY IN EFFECT FROM 10 AM THURSDAY TO 8 PM PDT FRIDAY
* WHAT...DANGEROUSLY HOT CONDITIONS WITH TEMPERATURES 90 TO NEAR 100
DEGREES POSSIBLE.
* 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...ABOVE AVERAGE TEMPERATURES OVERNIGHT WILL
LIMIT OVERNIGHT RELIEF FROM THE HEAT. WIDESPREAD MODERATE TO
LOCALLY MAJOR HEATRISK.
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.
APR
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