Extreme Heat Watch
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
614 AM PDT Mon Aug 18 2025
CAZ038-342>345-353-190100-
/O.CON.KLOX.XH.A.0001.250820T2000Z-250824T0400Z/
Cuyama Valley-Santa Lucia Mountains-Southern Salinas Valley-San
Luis Obispo County Interior Valleys-San Luis Obispo County
Mountains-Santa Barbara County Interior Mountains-
Including the cities of Irish Hills, Shandon, Caliente Range, San
Miguel, Lake Nacimiento, Atascadero, Big Pine Mountain, Creston,
Paso Robles, La Panza Range, Carrizo Plain, Figueroa Mountain,
San Rafael Mountain, Hearst Castle, New Cuyama, Templeton, and
Santa Margarita Lake
614 AM PDT Mon Aug 18 2025
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH SATURDAY EVENING...
* WHAT...Dangerously hot conditions with temperatures up to 105
possible.
* WHERE...Cuyama Valley, San Luis Obispo County Interior Valleys,
San Luis Obispo County Mountains, Santa Barbara County Interior
Mountains, Santa Lucia Mountains, and Southern Salinas Valley.
* WHEN...From Wednesday afternoon through Saturday evening.
* IMPACTS...There is a high risk for dangerous heat illness for
anyone, especially for the very young, the very old, those without
air conditioning, and those active outdoors.
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.
Monitor the latest forecasts and warnings for updates.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
614 AM PDT Mon Aug 18 2025
CAZ088-356>358-371>375-548-190100-
/O.CON.KLOX.XH.A.0001.250820T2000Z-250824T0400Z/
Santa Clarita Valley-Lake Casitas-Ojai Valley-Central Ventura
County Valleys-Calabasas and Agoura Hills-Western San Fernando
Valley-Eastern San Fernando Valley-Southeastern Ventura County
Valleys-Santa Susana Mountains-Los Angeles County San Gabriel
Valley-
Including the cities of Santa Paula, Glendale, El Monte,
Moorpark, Simi Valley, Northridge, Valencia, Newbury Park,
Thousand Oaks, La Canada Flintridge, East Los Angeles, San
Gabriel, Universal City, Ojai, Sunland, Woodland Hills, Piru,
Malibu Lake, Meiners Oaks, Chatsworth, Newhall, Oak View, Santa
Clarita, Fillmore, Oat Mountain, Lake Castaic, Westlake Village,
Van Nuys, Burbank, Pasadena, and Pomona
614 AM PDT Mon Aug 18 2025
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH SATURDAY EVENING...
* WHAT...Dangerously hot conditions with temperatures up to 104
possible.
* WHERE...Calabasas and Agoura Hills, Central Ventura County
Valleys, Eastern San Fernando Valley, Lake Casitas, Los Angeles
County San Gabriel Valley, Ojai Valley, Santa Clarita Valley,
Santa Susana Mountains, Southeastern Ventura County Valleys, and
Western San Fernando Valley.
* WHEN...From Wednesday afternoon through Saturday evening.
* IMPACTS...There is a high risk for dangerous heat illness for
anyone, especially for the very young, the very old, those without
air conditioning, and those active outdoors.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
Monitor the latest forecasts and warnings for updates.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
614 AM PDT Mon Aug 18 2025
CAZ348-190100-
/O.CON.KLOX.XH.A.0001.250820T2000Z-250824T0400Z/
Santa Ynez Valley-
Including the cities of Santa Ynez, Los Olivos, Solvang, and Lake
Cachuma
614 AM PDT Mon Aug 18 2025
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH SATURDAY EVENING...
* WHAT...Dangerously hot conditions with temperatures up to 102
possible.
* WHERE...Santa Ynez Valley.
* WHEN...From Wednesday afternoon through Saturday evening.
* IMPACTS...There is a high risk for dangerous heat illness for
anyone, especially for the very young, the very old, those without
air conditioning, and those active outdoors.
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.
Monitor the latest forecasts and warnings for updates.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
614 AM PDT Mon Aug 18 2025
CAZ376>380-190100-
/O.CON.KLOX.XH.A.0001.250820T2000Z-250824T0400Z/
Southern Ventura County Mountains-Northern Ventura County
Mountains-Interstate 5 Corridor-Western San Gabriel Mountains and
Highway 14 Corridor-Eastern San Gabriel Mountains-
Including the cities of Mount Pinos, Gorman, Acton, Tejon Pass,
Wrightwood, Topatopa Mountains, Warm Springs, Matilija, Lockwood
Valley, Mill Creek, Mount Wilson, Pyramid Lake, The Angeles Crest
Highway, Ozena, Mount Baldy, and Rose Valley
614 AM PDT Mon Aug 18 2025
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH SATURDAY EVENING...
* WHAT...Dangerously hot conditions with temperatures up to 104
possible.
* WHERE...Eastern San Gabriel Mountains, Interstate 5 Corridor,
Northern Ventura County Mountains, Southern Ventura County
Mountains, and Western San Gabriel Mountains and Highway 14
Corridor.
* WHEN...From Wednesday afternoon through Saturday evening.
* IMPACTS...There is a high risk for dangerous heat illness for
anyone, especially for the very young, the very old, those without
air conditioning, and those active outdoors.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
614 AM PDT Mon Aug 18 2025
CAZ381>383-190100-
/O.CON.KLOX.XH.A.0001.250820T2000Z-250824T0400Z/
Western Antelope Valley Foothills-Eastern Antelope Valley
Foothills-Antelope Valley-
Including the cities of Llano, Pearblossom, Palmdale, Lake Los
Angeles, Lancaster, Lake Palmdale, Elizabeth Lake, and Valyermo
614 AM PDT Mon Aug 18 2025
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY AFTERNOON
THROUGH SATURDAY EVENING...
* WHAT...Dangerously hot conditions with temperatures up to 108
possible.
* WHERE...Antelope Valley, Eastern Antelope Valley Foothills, and
Western Antelope Valley Foothills.
* WHEN...From Wednesday afternoon through Saturday evening.
* IMPACTS...There is a high risk for dangerous heat illness for
anyone, especially for the very young, the very old, those without
air conditioning, and those active outdoors.
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.
&&
$$
Visit us at http://www.weather.gov/LosAngeles
Hall
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
158 AM PDT Mon Aug 18 2025
CAZ048-182115-
/O.CON.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
San Bernardino and Riverside County Valleys-The Inland Empire-
Including the cities of Fontana, Corona, Riverside, Rancho
Cucamonga, Ontario, Moreno Valley, and San Bernardino
158 AM PDT Mon Aug 18 2025
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM THURSDAY MORNING
THROUGH FRIDAY EVENING...
* WHAT...Dangerously hot conditions with temperatures of 99 to 104
possible.
* WHERE...San Bernardino and Riverside County Valleys-The Inland
Empire.
* WHEN...From Thursday morning through Friday evening.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
158 AM PDT Mon Aug 18 2025
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
158 AM PDT Mon Aug 18 2025
CAZ060-182115-
/O.EXA.KSGX.XH.A.0002.250821T1700Z-250823T0300Z/
Apple and Lucerne Valleys-
Including the cities of Hesperia, Apple Valley, Lucerne Valley,
and Victorville
158 AM PDT Mon Aug 18 2025
...EXTREME HEAT WATCH IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY
EVENING...
* WHAT...Dangerously hot conditions with temperatures up to 106
possible.
* WHERE...Apple and Lucerne Valleys.
* WHEN...From Thursday morning through Friday evening.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Las Vegas NV
106 AM PDT Mon Aug 18 2025
AZZ001>003-036-CAZ522>527-NVZ015>022-182115-
/O.NEW.KVEF.XH.A.0005.250820T1500Z-250824T0600Z/
Northwest Plateau-Lake Havasu and Fort Mohave-Northwest Deserts-
Lake Mead National Recreation Area-Death Valley National Park-
Western Mojave Desert-Eastern Mojave Desert-Morongo Basin-Cadiz
Basin-San Bernardino County-Upper Colorado River Valley-Lincoln
County-Northeast Clark County-Western Clark and Southern Nye
County-Sheep Range-Spring Mountains-Red Rock Canyon-Las Vegas
Valley-Lake Mead National Recreation Area-Southern Clark County-
Including the cities of Oatman, Desert Hills, Shoshone,
Searchlight, Hiko, Vidal Junction, Mt Charleston, Baker, Hayford
Pk, Mountain Pass, Mt Trumbull, Panaca, Stovepipe Wells, Tuweep,
Primm, Lake Havasu City, Dolan Springs, Pipe Spring National
Monument, Daggett, Desert Rock, Morongo Valley, Pahrump, Moapa,
Mitchell Caverns, Amargosa Valley, Alamo, Henderson, Cal-Nev-Ari,
Boulder City, Red Rock Canyon, Barstow, Laughlin, Colorado City,
Twentynine Palms, Bullhead City, Wikieup, Yucca Valley, Kingman,
Overton, Caliente, Indian Springs, Hoover Dam, Needles, Las
Vegas, Rachel, Valentine, Western Grand Canyon, Furnace Creek,
Pioche, Topock, North Las Vegas, Yucca, Mesquite, Golden Valley,
Fort Irwin, and Mohave Valley
106 AM PDT Mon Aug 18 2025 /106 AM MST Mon Aug 18 2025/
...EXTREME HEAT WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH
SATURDAY EVENING...
* WHAT...Dangerously hot conditions with high temperatures around
105 in
Kingman, Golden Valley, and Dolan Springs; around 110 in Las Vegas,
Pahrump, Barstow-Daggett, the Morongo Basin and Twentynine Palms,
and 115 in Laughlin, Bullhead City, Needles, and Lake Havasu City,
and around 120 at Furnace Creek in Death Valley National Park.
Minimal overnight relief from the heat is expected as low
temperatures remain very warm.
* WHERE...Portions of northwest Arizona, southeast California, and
south central and southern Nevada.
* WHEN...From Wednesday morning through Saturday evening.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Above normal daytime temperatures combined
with minimal overnight relief from the heat will increase
potential heat impacts.
* ADDITIONAL DETAILS...Widespread Major to isolated Extreme Heat
Risk is possible, which could affect much of the general
population without proper hydration or adequate cooling.
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.
Monitor the latest forecasts and warnings for updates.
&&
$$
For more information from the National Weather Service visit
http://weather.gov/lasvegas
AN
