Extreme Heat Warning
URGENT - WEATHER MESSAGE
National Weather Service Flagstaff AZ
123 AM MST Fri Aug 1 2025
AZZ006-060200-
/O.EXT.KFGZ.XH.W.0004.000000T0000Z-250806T0200Z/
Grand Canyon Country-
Including the cities of Grand Canyon Village, North Rim, and
Supai
123 AM MST Fri Aug 1 2025
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 7 PM MST TUESDAY BELOW
4000 FEET...
* WHAT...Dangerously hot conditions below 4000 feet, with daytime
temperatures ranging from 101 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...
Stay cool, stay hydrated, stay informed.
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.
&&
$$
Meola
URGENT - WEATHER MESSAGE
National Weather Service Tucson AZ
145 PM MST Fri Aug 1 2025
AZZ501>507-509-515-021300-
/O.NEW.KTWC.XH.A.0005.250806T1700Z-250809T0300Z/
/O.EXT.KTWC.XH.W.0005.000000T0000Z-250806T0300Z/
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 Sierra Vista, Organ Pipe Cactus N.M.,
Marana, Safford, Tucson, Benson, Green Valley, Nogales, Ajo,
Oracle, Vail, Kitt Peak, Sells, Clifton, Mammoth, and Picacho
Peak State Park
145 PM MST Fri Aug 1 2025
...EXTREME HEAT WARNING NOW IN EFFECT UNTIL 8 PM MST TUESDAY...
...EXTREME HEAT WATCH 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
1206 PM MST Fri Aug 1 2025
AZZ534-538-539-541-549-552>555-559-020900-
/O.CON.KPSR.XH.W.0005.000000T0000Z-250803T0300Z/
/O.CON.KPSR.XH.A.0004.250805T1700Z-250809T0300Z/
Aguila Valley-Tonopah Desert-Gila Bend-Cave Creek/New River-
Fountain Hills/East Mesa-Superior-Northwest Pinal County-West
Pinal County-Apache Junction/Gold Canyon-Sonoran Desert Natl
Monument-
Including the cities of Aguila, Hassayampa, Cactus Forest, Kaka,
Fountain Hills, Sentinel, Casa Grande, Scottsdale, Gladden,
Florence, Wickenburg, Wintersburg, Tonopah, Gila Bend, Coolidge,
Arlington, Apache Junction, and Superior
1206 PM MST Fri Aug 1 2025
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST SATURDAY...
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM TUESDAY MORNING THROUGH
FRIDAY EVENING...
* WHAT...For the Extreme Heat Warning, dangerously hot conditions.
Afternoon temperatures 107 to 114. Major Heat Risk. Overexposure
can cause heat cramps and heat exhaustion to develop and, without
intervention, can lead to heat stroke. For the Extreme Heat Watch,
dangerously hot conditions possible. Afternoon temperatures 108 to
118. Extreme Heat Risk.
* WHERE...Sonoran Desert National Monument, Aguila Valley, Tonopah
Desert, Gila Bend, Cave Creek/New River, Fountain Hills/East Mesa,
Superior, Northwest Pinal County, West Pinal County, and Apache
Junction/Gold Canyon.
* WHEN...For the Extreme Heat Warning, until 8 PM MST Saturday. For
the Extreme Heat Watch, from Tuesday morning through Friday
evening.
* 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.
An Extreme Heat Watch means that a period of very hot temperatures,
even by local standards, may occur. Actions should be taken to
lessen the impact of the extreme heat.
&&
$$
URGENT - WEATHER MESSAGE
National Weather Service Phoenix AZ
1206 PM MST Fri Aug 1 2025
AZZ537-540-542>544-546-548-550-551-020900-
/O.CON.KPSR.XH.W.0005.000000T0000Z-250803T0300Z/
/O.CON.KPSR.XH.A.0004.250805T1700Z-250809T0300Z/
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 Phoenix, Sun Lakes, Surprise, Avondale,
Wittmann, Circle City, Tempe, Peoria, Beardsley, Mesa, Goodyear,
Paradise Valley, Liberty, Gilbert, Chandler, Sun City West, Queen
Creek, and Cashion
1206 PM MST Fri Aug 1 2025
...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST SATURDAY...
...EXTREME HEAT WATCH REMAINS IN EFFECT FROM TUESDAY MORNING THROUGH
FRIDAY EVENING...
* WHAT...For the Extreme Heat Warning, dangerously hot conditions.
Afternoon temperatures 109 to 114. Major Heat Risk. Overexposure
can cause heat cramps and heat exhaustion to develop and, without
intervention, can lead to heat stroke. For the Extreme Heat Watch,
dangerously hot conditions possible. Afternoon temperatures 110 to
118. Extreme Heat Risk.
* WHERE...The Northwest Valley of the Phoenix Metro Area, The East
Valley of the Phoenix Metro Area, Buckeye/Avondale, Deer Valley,
Central Phoenix, North Phoenix/Glendale, Scottsdale/Paradise
Valley, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek.
* WHEN...For the Extreme Heat Warning, until 8 PM MST Saturday. For
the Extreme Heat Watch, from Tuesday morning through Friday
evening.
* 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.
An Extreme Heat Watch means that a period of very hot temperatures,
even by local standards, may occur. Actions should be taken to
lessen the impact of the extreme heat.
&&
$$
