805
WWUS76 KSGX 180858
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
158 AM PDT Mon Aug 18 2025

CAZ060-182115-
/O.EXA.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
Apple and Lucerne Valleys-
Including the cities of Hesperia, Apple Valley, Lucerne Valley,
and Victorville
158 AM PDT Mon Aug 18 2025

...EXTREME HEAT WATCH IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY
EVENING...

* WHAT...Dangerously hot conditions with temperatures up to 106
  possible.

* WHERE...Apple and Lucerne Valleys.

* WHEN...From Thursday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat events.

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.

&&

$$

CAZ048-182115-
/O.CON.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Fontana, Corona, Riverside, Rancho
Cucamonga, Ontario, Moreno Valley, and San Bernardino
158 AM PDT Mon Aug 18 2025

...EXTREME HEAT WATCH REMAINS IN EFFECT FROM THURSDAY MORNING
THROUGH FRIDAY EVENING...

* WHAT...Dangerously hot conditions with temperatures of 99 to 104
  possible.

* WHERE...San Bernardino and Riverside County Valleys-The Inland
  Empire.

* WHEN...From Thursday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat events.

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.

&&

$$

CAZ055-056-058-182115-
/O.CON.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
San Bernardino County Mountains-Riverside County Mountains-San
Diego County Mountains-
Including the cities of Pine Valley, Wrightwood, Big Bear Lake,
Big Bear City, Julian, Idyllwild-Pine Cove, Lake Arrowhead,
Running Springs, and Crestline
158 AM PDT Mon Aug 18 2025

...EXTREME HEAT WATCH REMAINS IN EFFECT FROM THURSDAY MORNING
THROUGH FRIDAY EVENING...

* WHAT...Dangerously hot conditions with temperatures of 90 to 99
  possible.

* WHERE...Riverside County Mountains, San Bernardino County
  Mountains, and San Diego County Mountains.

* WHEN...From Thursday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat events.

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.

&&

$$

CAZ061-062-065-182115-
/O.CON.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
Coachella Valley-San Diego County Deserts-San Gorgonio Pass near
Banning-
Including the cities of Palm Desert Country, Coachella, La
Quinta, Palm Desert, Indio, Borrego Springs, Palm Springs, and
Cathedral City
158 AM PDT Mon Aug 18 2025

...EXTREME HEAT WATCH REMAINS IN EFFECT FROM THURSDAY MORNING
THROUGH FRIDAY EVENING...

* WHAT...Dangerously hot conditions with temperatures of 110 to 114
  possible.

* WHERE...Coachella Valley, San Diego County Deserts, and San
  Gorgonio Pass near Banning.

* WHEN...From Thursday morning through Friday evening.

* IMPACTS...Heat related illnesses increase significantly during
  extreme heat events.

* ADDITIONAL DETAILS...There is some uncertainty in high
  temperatures with the return of monsoon moisture. However, warm
  nights with lows in the upper 80s to low 90s will offer little
  relief even if daytime highs are lower due to moisture.

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.

&&

$$

SS