Extreme Heat Warning
URGENT - WEATHER MESSAGE
National Weather Service Flagstaff AZ
1148 AM MST Sat Aug 2 2025
AZZ006-040000-
/O.CON.KFGZ.XH.W.0004.000000T0000Z-250806T0200Z/
Grand Canyon Country-
Including the cities of North Rim, Supai, and Grand Canyon
Village
1148 AM MST Sat Aug 2 2025
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM MST TUESDAY
BELOW 4000 FEET...
* WHAT...Dangerously hot conditions below 4000 feet, with daytime
temperatures ranging from 103 degrees at Havasupai Gardens, to 113
degrees at Phantom Ranch.
* WHERE...Lower elevations of the Grand Canyon.
* WHEN...Until 7 PM MST Tuesday.
* IMPACTS...Most individuals will be at risk for heat-related
illnesses without effective cooling or adequate hydration,
especially with prolonged outdoor exposure.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This warning is reserved for only the hottest days of the year and
is issued when temperatures are expected to rise to dangerous levels.
Day hikers on Bright Angel Trail should descend no farther than 1
1/2 miles from the upper trailhead. Between the hours of 10 AM and 4
PM, hikers should be out of the canyon or at Havasupai Gardens or
Bright Angel campgrounds, physical activity is discouraged. All
hikers should have adequate gear, including a wide-brimmed hat,
sunscreen, salty snacks, sufficient water, and electrolyte mix.
Doubling your calorie intake helps maintain your energy.
Hike smart.
Take action when you see symptoms of heat exhaustion and heat
stroke. Anyone overcome by heat should be moved to a cool and shaded
location. Heat stroke is an emergency! Call 9 1 1.
Stay cool, stay hydrated, stay informed.
&&
$$
Humphreys
URGENT - WEATHER MESSAGE
National Weather Service Tucson AZ
101 PM MST Sat Aug 2 2025
AZZ501>507-509-515-031215-
/O.CON.KTWC.XH.W.0005.000000T0000Z-250806T0300Z/
/O.CON.KTWC.XH.A.0005.250806T1700Z-250809T0300Z/
Western Pima County-Tohono O`odham Nation-Upper Santa Cruz River
Valley/Altar Valley-Tucson Metro Area-South Central Pinal County-
Southeast Pinal County-Upper San Pedro River Valley-Upper Gila
River Valley-Baboquivari Mountains-
Including the cities of Ajo, Organ Pipe Cactus N.M., Clifton,
Green Valley, Benson, Oracle, Kitt Peak, Tucson, Marana, Mammoth,
Sells, Picacho Peak State Park, Sierra Vista, Vail, Safford, and
Nogales
101 PM MST Sat Aug 2 2025
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST TUESDAY...
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM WEDNESDAY MORNING
THROUGH FRIDAY EVENING...
* WHAT...For the Extreme Heat Warning, dangerously hot conditions
with temperatures up to 110. For the Extreme Heat Watch,
dangerously hot conditions with temperatures up to 115 possible,
especially across portions of Pima county and south-central Pinal
county.
* WHERE...South Central Pinal County, Southeast Pinal County, Tohono
O`odham Nation, Tucson Metro Area, Upper Gila River Valley, Upper
San Pedro River Valley, Upper Santa Cruz River Valley/Altar
Valley, and Western Pima County.
* WHEN...For the Extreme Heat Warning, until 8 PM MST Tuesday. For
the Extreme Heat Watch, from Wednesday morning through Friday
evening.
* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Do not leave young children and pets in unattended vehicles. Car
interiors will reach lethal temperatures in a matter of minutes.
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.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1237 PM MST Sat Aug 2 2025
AZZ547-030745-
/O.UPG.KPSR.XH.A.0004.250805T1700Z-250809T0300Z/
/O.NEW.KPSR.XH.W.0006.250805T1700Z-250809T0300Z/
Rio Verde/Salt River-
Including the cities of Tortilla Flat
1237 PM MST Sat Aug 2 2025
...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM MST
FRIDAY...
* WHAT...Dangerously hot conditions possible. Afternoon temperatures
106 to 117. Major Heat Risk.
* WHERE...Rio Verde/Salt River.
* WHEN...From 10 AM Tuesday to 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.
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
1237 PM MST Sat Aug 2 2025
AZZ534-537>544-546-548>555-559-030745-
/O.CAN.KPSR.XH.A.0004.250805T1700Z-250809T0300Z/
/O.EXT.KPSR.XH.W.0005.000000T0000Z-250809T0300Z/
Aguila Valley-Northwest Valley-Tonopah Desert-Gila Bend-
Buckeye/Avondale-Cave Creek/New River-Deer Valley-Central Phoenix-
North Phoenix/Glendale-Scottsdale/Paradise Valley-East Valley-
Fountain Hills/East Mesa-South Mountain/Ahwatukee-Southeast
Valley/Queen Creek-Superior-Northwest Pinal County-West Pinal
County-Apache Junction/Gold Canyon-Sonoran Desert Natl Monument-
Including the cities of Apache Junction, Goodyear, Beardsley,
Wickenburg, Scottsdale, Wittmann, Superior, Florence, Tonopah,
Cashion, Kaka, Arlington, Coolidge, Sun City West, Aguila, Casa
Grande, Peoria, Avondale, Gila Bend, Mesa, Chandler, Liberty,
Paradise Valley, Cactus Forest, Sentinel, Hassayampa, Tempe,
Wintersburg, Gladden, Gilbert, Sun Lakes, Queen Creek, Phoenix,
Fountain Hills, Circle City, and Surprise
1237 PM MST Sat Aug 2 2025
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 8 PM MST FRIDAY...
* WHAT...Dangerously hot conditions. Afternoon temperatures 107 to
114 expected through early next week, increasing to 113 to 118 mid
to late next week. Major to extreme Heat Risk.
* WHERE...Portions of south central Arizona.
* 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.
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
1237 PM MST Sat Aug 2 2025
AZZ545-556>558-560>563-030745-
/O.UPG.KPSR.XH.A.0004.250805T1700Z-250809T0300Z/
/O.NEW.KPSR.XH.W.0006.250805T1700Z-250809T0300Z/
New River Mesa-Tonto Basin-Mazatzal Mountains-Pinal/Superstition
Mountains-San Carlos-Dripping Springs-Globe/Miami-Southeast Gila
County-
Including the cities of Peridot, Globe, Miami, Sunflower,
Winkelman, Hayden, San Carlos, and Punkin Center
1237 PM MST Sat Aug 2 2025
...EXTREME HEAT WARNING IN EFFECT FROM 10 AM TUESDAY TO 8 PM MST
FRIDAY...
* WHAT...Dangerously hot conditions possible. Afternoon temperatures
97 to 113. Extreme Heat Risk.
* WHERE...Dripping Springs, Globe/Miami, Mazatzal Mountains, New
River Mesa, Pinal/Superstition Mountains, San Carlos, Southeast
Gila County, and Tonto Basin.
* WHEN...From 10 AM Tuesday to 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.
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
1237 PM MST Sat Aug 2 2025
AZZ530>533-535-536-CAZ560>570-030745-
/O.UPG.KPSR.XH.A.0004.250806T1700Z-250809T0300Z/
/O.NEW.KPSR.XH.W.0006.250806T1700Z-250809T0300Z/
Parker Valley-Kofa-Yuma-Central La Paz-Southeast Yuma County-Gila
River Valley-Joshua Tree NP West-Joshua Tree NP East-Imperial
County Southwest-Salton Sea-Chuckwalla Mountains-Imperial County
Southeast-Imperial County West-Imperial Valley-Chiriaco Summit-
Palo Verde Valley-Chuckwalla Valley-
Including the cities of Brawley, Martinez Lake, Ehrenberg,
Harcuvar, Palm Canyon, Ligurta, Ripley, Vicksburg Junction,
Imperial Hot Mineral Springs, Palo Verde, Blythe, Yuma, Salome,
Parker, Mountain Spring, Quartzsite, El Centro, Brenda, Salton
City, Winterhaven, Winona, Midland, Plaster City, Fortuna
Foothills, Calexico, Cottonwood Visitor, Coolidge Springs, Coyote
Wells, Alamorio, Ocotillo, Vicksburg, Desert Shores, Chiriaco
Summit, and Lost Horse-Keys Village
1237 PM MST Sat Aug 2 2025 /1237 PM PDT Sat Aug 2 2025/
...EXTREME HEAT WARNING IN EFFECT FROM 10 AM MST /10 AM PDT/
WEDNESDAY TO 8 PM MST /8 PM PDT/ FRIDAY...
* WHAT...Dangerously hot conditions possible. Afternoon temperatures
108 to 118. Major Heat Risk.
* WHERE...Portions of southwest Arizona and southeast and southern
California.
* WHEN...From 10 AM MST /10 AM PDT/ Wednesday to 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.
&&
$$
