Extreme Heat Warning
URGENT - WEATHER MESSAGE
National Weather Service Las Vegas NV
132 PM PDT Mon Aug 17 2026
AZZ002-570-571-575-576-CAZ522-524>527-NVZ016-017-020-022-025-026-
181200-
/O.CON.KVEF.XH.W.0004.260818T1700Z-260822T0300Z/
Lake Havasu and Fort Mohave-Lake Mead - AZ side-Lake Mohave - AZ
side-Hualapai Mountains-Northwest Deserts-Death Valley National
Park-Eastern Mojave Desert-Morongo Basin-Cadiz Basin-San
Bernardino County-Upper Colorado River Valley-Northeast Clark
County-Western Clark and Southern Nye County-Las Vegas Valley-
Southern Clark County-Lake Mead - NV side-Lake Mohave - NV side-
Including the cities of Kingman, South Cove, Overton, Hoover Dam,
Primm, Yucca, Furnace Creek, Las Vegas, Amargosa Valley, Stovepipe
Wells, Valentine, Morongo Valley, Vidal Junction, Searchlight,
Pahrump, Boulder City, Mountain Pass, Temple Bar,
Lake Havasu City, Hualapai Peak, Desert Rock, Cal-Nev-Ari,
Laughlin, Twentynine Palms, North Las Vegas, Mitchell Caverns, Desert
Hills, Shoshone, Dolan Springs, Topock, Golden Valley, Moapa, Yucca
Valley, Indian Springs, Mesquite, Wikieup, Bullhead City, Baker,
Needles, and Henderson
132 PM PDT Mon Aug 17 2026 /132 PM MST Mon Aug 17 2026/
...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 10 AM PDT /10 AM MST/
TUESDAY TO 8 PM PDT /8 PM MST/ FRIDAY...
* WHAT...Dangerously hot conditions with temperatures up to 115 to
118 degrees expected through Death Valley and the lower Colorado
River Valley, with highs between 107 to 110 degrees elsewhere.
* WHERE...Portions of northwest Arizona, southeast California, and
southern Nevada.
* WHEN...From 10 AM PDT /10 AM MST/ Tuesday to 8 PM PDT /8 PM MST/
Friday.
* 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.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
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.
Monitor the latest forecasts and warnings for updates.
&&
$$
JP
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1147 AM MST Mon Aug 17 2026
AZZ530>533-535-536-CAZ562-565>567-569-570-181000-
/O.CON.KPSR.XH.W.0008.000000T0000Z-260822T0300Z/
Parker Valley-Kofa-Yuma-Central La Paz-Southeast Yuma County-Gila
River Valley-Imperial County Southwest-Imperial County Southeast-
Imperial County West-Imperial Valley-Palo Verde Valley-Chuckwalla
Valley-
Including the cities of Yuma, Winona, Brenda, Ocotillo, Ehrenberg,
Calexico, Alamorio, Salome, Winterhaven, Mountain Spring, Palo Verde,
Coyote Wells, Midland, Palm Canyon, Vicksburg Junction, Coolidge
Springs, Parker, Martinez Lake, Quartzsite, Vicksburg, Ligurta, El
Centro, Salton City, Harcuvar, Blythe, Brawley, Ripley, Plaster City,
and Fortuna Foothills
1147 AM MST Mon Aug 17 2026 /1147 AM PDT Mon Aug 17 2026/
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST /8 PM PDT/
FRIDAY...
* WHAT...Dangerously hot and humid conditions. Afternoon temperatures
106 to 114 expected. Major Heat Risk.
* WHERE...Portions of southwest Arizona and southeast California.
* WHEN...Until 8 PM MST /8 PM PDT/ Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
An Extreme Heat Warning means that a period of very hot temperatures,
even by local standards, will occur. Actions should be taken to
lessen the impact of the extreme heat.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible and
drink plenty of water.
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.
Public cooling shelters are available in some areas. Consult county
officials for more details.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1147 AM MST Mon Aug 17 2026
AZZ534-538-539-541-549-553>555-559-181000-
/O.CON.KPSR.XH.W.0008.000000T0000Z-260822T0300Z/
Aguila Valley-Tonopah Desert-Gila Bend-Cave Creek/New River-
Fountain Hills/East Mesa-Northwest Pinal County-West Pinal County-
Apache Junction/Gold Canyon-Sonoran Desert Natl Monument-
Including the cities of Wickenburg, Fountain Hills, Arlington,
Coolidge, Gladden, Casa Grande, Cactus Forest, Apache Junction, Kaka,
Aguila, Florence, Tonopah, Wintersburg, Hassayampa, Scottsdale,
Sentinel, and Gila Bend
1147 AM MST Mon Aug 17 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY...
* WHAT...Dangerously hot conditions. Afternoon temperatures 105 to
113 expected. Major Heat Risk.
* WHERE...Aguila Valley, Apache Junction/Gold Canyon, Cave Creek/New
River, Fountain Hills/East Mesa, Gila Bend, Northwest Pinal County,
Sonoran Desert Natl Monument, and Tonopah Desert.
* WHEN...Until 8 PM MST Friday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.
* ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 to find a free
cooling center, transportation, water and more.
https://www.maricopa.gov/heat
PRECAUTIONARY/PREPAREDNESS ACTIONS...
An Extreme Heat Warning means that a period of very hot temperatures,
even by local standards, will occur. Actions should be taken to
lessen the impact of the extreme heat.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose-fitting clothing when possible and
drink plenty of water.
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.
Public cooling shelters are available in some areas. Consult county
officials for more details.
&&
$$
Heat Advisory
URGENT - WEATHER MESSAGE
National Weather Service Los Angeles/Oxnard CA
613 AM PDT Mon Aug 17 2026
CAZ038-088-343>345-351-353-371>373-375-376-379-380-548-210300-
/O.CON.KLOX.HT.Y.0013.260818T1700Z-260821T0300Z/
Cuyama Valley-Santa Clarita Valley-Southern Salinas Valley-San
Luis Obispo County Interior Valleys-San Luis Obispo County
Mountains-Santa Ynez Mountains Western Range-Santa Barbara County
Interior Mountains-Calabasas and Agoura Hills-Western San
Fernando Valley-Eastern San Fernando Valley-Santa Susana
Mountains-Southern Ventura County Mountains-Western San Gabriel
Mountains and Highway 14 Corridor-Eastern San Gabriel Mountains-
Los Angeles County San Gabriel Valley-
Including the cities of Glendale, Chatsworth, Universal City,
Shandon, Atascadero, Newhall, Woodland Hills, Van Nuys, Wrightwood,
New Cuyama, San Gabriel, Santa Clarita, Warm Springs, Paso Robles,
Creston, San Rafael Mountain, Rose Valley, Pomona, San Marcos Pass,
Mount Baldy, Oat Mountain, East Los Angeles, Acton, The Angeles Crest
Highway, Sunland, Big Pine Mountain, Westlake Village, La Panza
Range, La Canada Flintridge, Malibu Lake, Pasadena, Valencia, Mount
Wilson, Lake Nacimiento, Lake Castaic, Mill Creek, El Monte, Topatopa
Mountains, San Miguel, Northridge, Burbank, Carrizo Plain, Caliente
Range, Figueroa Mountain, Matilija, Santa Margarita Lake, and
Templeton
613 AM PDT Mon Aug 17 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM 10 AM TUESDAY TO 8 PM PDT
THURSDAY...
* WHAT...High temperatures of 92 to 105 expected, with most areas
seeing peak heat on Wednesday and Thursday. Low temperatures are
expected to range from the upper 60s to lower 70s at lower
elevations to the mid 70s to lower 80s in the foothills and
mountains.
* WHERE...A portion of southwest California.
* WHEN...From 10 AM Tuesday to 8 PM PDT Thursday.
* IMPACTS...Hot temperatures may cause heat illnesses. Warmer than
normal low temperatures will add to the heat discomfort.
* ADDITIONAL DETAILS...The heat advisory may need to be extended into
Friday for portions of the forecast area, but there remains
considerable uncertainty at this time.
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.
Take extra precautions when outside. Wear lightweight and loose
fitting clothing. Try to limit strenuous activities to early morning
or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.
&&
$$
DG
Lake Wind Advisory
URGENT - WEATHER MESSAGE
National Weather Service Hanford CA
1035 AM PDT Mon Aug 17 2026
CAZ332-180145-
/O.NEW.KHNX.LW.Y.0022.260817T2000Z-260818T0300Z/
Kern River Valley-
Including the cities of Lake Isabella and Kernville
1035 AM PDT Mon Aug 17 2026
...LAKE WIND ADVISORY IN EFFECT UNTIL 8 PM PDT THIS EVENING...
* WHAT...West winds 10 to 20 mph with gusts up to 30 mph expected.
* WHERE...Kern River Valley.
* WHEN...Until 8 PM PDT this evening.
* IMPACTS...Strong winds and rough waves on area lakes will create
hazardous conditions for small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Winds this strong can make driving difficult, especially for high
profile vehicles. Use extra caution.
&&
$$
JPK
