Extreme Heat Warning
URGENT - WEATHER MESSAGE
National Weather Service Las Vegas NV
405 AM PDT Fri Aug 21 2026
AZZ002-570-571-576-CAZ522-527-NVZ020-025-026-220300-
/O.CON.KVEF.XH.W.0004.000000T0000Z-260824T0300Z/
Lake Havasu and Fort Mohave-Lake Mead - AZ side-Lake Mohave - AZ
side-Northwest Deserts-Death Valley National Park-San Bernardino
County-Upper Colorado River Valley-Las Vegas Valley-Lake Mead -
NV side-Lake Mohave - NV side-
Including the cities of Furnace Creek, Boulder City, Temple Bar, Las
Vegas, Yucca, Golden Valley, Henderson, Desert Hills, Needles,
Topock, Stovepipe Wells, Hoover Dam, Dolan Springs, Laughlin,
Valentine, Shoshone, Bullhead City, Lake Havasu City, Kingman, North
Las Vegas, Wikieup, and South Cove
405 AM PDT Fri Aug 21 2026 /405 AM MST Fri Aug 21 2026/
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/
SUNDAY...
* 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. Near
record warm low temperatures expected in urban areas.
* WHERE...Lake Mohave, Lake Mead, Lower Colorado River Valley / Lake
Havasu, Northwest Deserts, Death Valley National Park, and Las
Vegas Valley.
* WHEN...Until 8 PM PDT /8 PM MST/ Sunday.
* 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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Las Vegas NV
405 AM PDT Fri Aug 21 2026
AZZ575-CAZ524>526-NVZ016-017-022-220300-
/O.CON.KVEF.XH.W.0004.000000T0000Z-260822T0300Z/
Hualapai Mountains-Eastern Mojave Desert-Morongo Basin-Cadiz
Basin-Northeast Clark County-Western Clark and Southern Nye
County-Southern Clark County-
Including the cities of Overton, Twentynine Palms, Cal-Nev-Ari,
Mountain Pass, Baker, Indian Springs, Desert Rock, Mitchell Caverns,
Vidal Junction, Moapa, Amargosa Valley, Yucca Valley, Primm,
Mesquite, Pahrump, Hualapai Peak, Searchlight, and Morongo Valley
405 AM PDT Fri Aug 21 2026 /405 AM MST Fri Aug 21 2026/
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM PDT /8 PM MST/
THIS EVENING...
* WHAT...Dangerously hot conditions with high temperatures 104 to 108
and near record warm overnight low temperatures this morning.
* WHERE...In Arizona, Hualapai Mountains. In California, Cadiz Basin,
Eastern Mojave Desert, and Morongo Basin. In Nevada, Northeast
Clark County, Southern Clark County, and Western Clark and Southern
Nye County.
* WHEN...Until 8 PM PDT /8 PM MST/ this 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.
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.
&&
$$
JCS
URGENT - WEATHER MESSAGE
National Weather Service San Diego CA
142 AM PDT Fri Aug 21 2026
CAZ061-062-065-212230-
/O.EXT.KSGX.XH.W.0008.000000T0000Z-260829T0300Z/
Coachella Valley-San Diego County Deserts-San Gorgonio Pass near
Banning-
Including the cities of Cathedral City, Borrego Springs, Palm
Desert, Coachella, La Quinta, Indio, Palm Springs, and Palm
Desert Country
142 AM PDT Fri Aug 21 2026
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 8 PM PDT FRIDAY AUGUST
28TH...
* WHAT...Dangerously hot conditions with temperatures up to 113
through Sunday, and up to 115 for Tuesday through Friday of next
week.
* WHERE...Coachella Valley, San Diego County Deserts, and San
Gorgonio Pass near Banning.
* WHEN...Until 8 PM PDT Friday August 28th.
* 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.
&&
$$
17
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1106 PM MST Thu Aug 20 2026
AZZ530>533-535-536-CAZ562-565>567-569-570-212200-
/O.EXT.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
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 Winterhaven, Parker, Ligurta, Yuma, Coyote
Wells, El Centro, Coolidge Springs, Quartzsite, Alamorio, Vicksburg,
Ehrenberg, Ripley, Vicksburg Junction, Harcuvar, Blythe, Plaster
City, Salome, Martinez Lake, Winona, Fortuna Foothills, Mountain
Spring, Midland, Ocotillo, Salton City, Palm Canyon, Brenda,
Calexico, Brawley, and Palo Verde
1106 PM MST Thu Aug 20 2026 /1106 PM PDT Thu Aug 20 2026/
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 8 PM MST /8 PM PDT/
FRIDAY, AUGUST 28...
* WHAT...Dangerously hot conditions. It will also be humid through
the weekend. Afternoon temperatures 106 to 116 expected. Major to
Extreme Heat Risk.
* WHERE...Portions of southwest Arizona and southeast California.
* WHEN...Until 8 PM MST /8 PM PDT/ Friday, August 28.
* 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
1106 PM MST Thu Aug 20 2026
AZZ534-538-539-541-549-553>555-559-212200-
/O.EXT.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
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 Sentinel, Casa Grande, Tonopah, Kaka, Aguila,
Gila Bend, Arlington, Fountain Hills, Cactus Forest, Apache Junction,
Coolidge, Hassayampa, Florence, Wintersburg, Gladden, Scottsdale, and
Wickenburg
1106 PM MST Thu Aug 20 2026
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 8 PM MST FRIDAY, AUGUST
28...
* WHAT...Dangerously hot conditions. Afternoon temperatures 107 to
115 expected. Major to Extreme 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, August 28.
* 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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1106 PM MST Thu Aug 20 2026
AZZ537-540-542>544-546-548-550-551-212200-
/O.EXT.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
Northwest Valley-Buckeye/Avondale-Deer Valley-Central Phoenix-
North Phoenix/Glendale-Scottsdale/Paradise Valley-East Valley-
South Mountain/Ahwatukee-Southeast Valley/Queen Creek-
Including the cities of Paradise Valley, Chandler, Wittmann, Tempe,
Sun Lakes, Gilbert, Phoenix, Sun City West, Mesa, Beardsley,
Avondale, Queen Creek, Cashion, Peoria, Circle City, Surprise,
Liberty, and Goodyear
1106 PM MST Thu Aug 20 2026
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 8 PM MST FRIDAY, AUGUST
28...
* WHAT...Dangerously hot conditions. Afternoon temperatures 108 to
114 expected. Major to Extreme Heat Risk.
* WHERE...The Phoenix metropolitan area.
* WHEN...Until 8 PM MST Friday, August 28.
* 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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1106 PM MST Thu Aug 20 2026
AZZ560-212200-
/O.EXT.KPSR.XH.W.0008.000000T0000Z-260829T0300Z/
San Carlos-
Including the cities of Peridot and San Carlos
1106 PM MST Thu Aug 20 2026
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 8 PM MST FRIDAY, AUGUST
28...
* WHAT...Dangerously hot conditions. Afternoon temperatures 105 to
112 expected. Major to Extreme Heat Risk.
* WHERE...San Carlos.
* WHEN...Until 8 PM MST Friday, August 28.
* 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.
&&
$$
KB
URGENT - WEATHER MESSAGE
National Weather Service Tucson AZ
754 PM MST Thu Aug 20 2026
AZZ501-502-504>506-509-212015-
/O.CON.KTWC.XH.W.0006.000000T0000Z-260823T0300Z/
Western Pima County-Tohono O`odham Nation-Tucson Metro Area-South
Central Pinal County-Southeast Pinal County-Upper Gila River
Valley-
Including the cities of Mammoth, Tucson, Green Valley, Ajo, Organ
Pipe Cactus N.M., Vail, Sells, Marana, Picacho Peak State Park,
Safford, Clifton, and Oracle
754 PM MST Thu Aug 20 2026
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST SATURDAY...
* WHAT...Dangerously hot conditions with high temperatures ranging
between 103 to 111 degrees and low temperatures 79 to 85 degrees.
Major HeatRisk is expected.
* WHERE...Pinal County, Tohono O`odham Nation, Tucson Metro Area,
Upper Gila River Valley, and Western Pima County.
* WHEN...Until 8 PM MST Saturday.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks in
shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.
Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when possible and
drink plenty of water.
&&
$$
KM
Air Quality Alert
AZC013-240400-
Air Quality Alert
Relayed by National Weather Service Phoenix AZ
918 AM MST Fri Aug 21 2026
...OZONE HIGH POLLUTION ADVISORY FOR MARICOPA COUNTY INCLUDING THE
PHOENIX METRO AREA THROUGH SUNDAY...
The Arizona Department of Environmental Quality (ADEQ) has issued an
Ozone High Pollution Advisory for the Phoenix Metro Area through Sunday.
This means that forecast weather conditions combined with existing
ozone levels are expected to result in local maximum 8-hour ozone
concentrations that pose a health risk. Adverse health effects
increase as air quality deteriorates.
Ozone is an air contaminant which can cause breathing difficulties
for children, older adults, as well as persons with respiratory
problems. A decrease in physical activity is recommended.
You are urged to car pool, telecommute or use mass transit.
The use of gasoline-powered equipment should be reduced or done late
in the day.
For details on this High Pollution Advisory, visit the ADEQ internet
site at www.azdeq.gov/forecast/phoenix or call 602-771-2300.
$$
