141
WWUS76 KSGX 200432
NPWSGX

URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
932 PM PDT Tue Aug 19 2025

CAZ060-201315-
/O.CON.KSGX.XH.W.0003.250820T1700Z-250824T0300Z/
Apple and Lucerne Valleys-
Including the cities of Lucerne Valley, Apple Valley, Hesperia,
and Victorville
932 PM PDT Tue Aug 19 2025

...EXTREME HEAT WARNING REMAINS 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.

Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.

&&

$$

CAZ061-062-065-201315-
/O.CON.KSGX.XH.W.0003.250820T1700Z-250824T0300Z/
Coachella Valley-San Diego County Deserts-San Gorgonio Pass near
Banning-
Including the cities of Indio, Palm Desert, Cathedral City,
Coachella, La Quinta, Palm Desert Country, Borrego Springs, and
Palm Springs
932 PM PDT Tue Aug 19 2025

...EXTREME HEAT WARNING REMAINS 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.

Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.

&&

$$

CAZ048-201315-
/O.CON.KSGX.HT.Y.0005.250820T1700Z-250824T0300Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of San Bernardino, Fontana, Moreno Valley,
Riverside, Corona, Ontario, and Rancho Cucamonga
932 PM PDT Tue Aug 19 2025

...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT
SATURDAY...

* WHAT...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.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

&&

$$

CAZ050-201315-
/O.CON.KSGX.HT.Y.0005.250820T1700Z-250823T0300Z/
San Diego County Valleys-
Including the cities of Poway, Santee, San Marcos, La Mesa,
Escondido, and El Cajon
932 PM PDT Tue Aug 19 2025

...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT
FRIDAY...

* WHAT...Temperatures in the mid 90s up to 102 for the inland
  valleys.

* 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 and foothills.

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.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

&&

$$

CAZ055-056-058-201315-
/O.CON.KSGX.HT.Y.0005.250820T1700Z-250823T0300Z/
San Bernardino County Mountains-Riverside County Mountains-San
Diego County Mountains-
Including the cities of Big Bear Lake, Wrightwood, Big Bear City,
Crestline, Julian, Pine Valley, Lake Arrowhead, Idyllwild-Pine
Cove, and Running Springs
932 PM PDT Tue Aug 19 2025

...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO 8 PM PDT
FRIDAY...

* WHAT...Temperatures in the 90s to around 100 below 5500 feet
  elevation.

* 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.

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.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

&&

$$

CAZ057-554-201315-
/O.CON.KSGX.HT.Y.0005.250821T1700Z-250823T0300Z/
Santa Ana Mountains and Foothills-Orange County Inland Areas-
Including the cities of Irvine, Garden Grove, Fullerton, Orange,
Anaheim, Santa Ana, and Mission Viejo
932 PM PDT Tue Aug 19 2025

...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM THURSDAY TO 8 PM PDT
FRIDAY...

* WHAT...Temperatures 90 to 98 degrees.

* 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.

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.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

&&

$$

SS