Extreme Heat Warning
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.
&&
$$
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 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.
&&
$$
Humphreys
Red Flag Warning
URGENT - FIRE WEATHER MESSAGE
National Weather Service Salt Lake City UT
1053 PM MDT Sat Aug 2 2025
UTZ483-484-488-489-492>498-031300-
/O.CON.KSLC.FW.W.0009.250804T1800Z-250806T0300Z/
Southern Ashley National Forest-Tavaputs Plateau-
Manti National Forest-San Rafael Swell-Central Utah West Desert-
Central Utah Mountains-Henry Mountains-Color Country West Desert-
Color Country Mountains-Mojave Desert-Grand Staircase-
1053 PM MDT Sat Aug 2 2025
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON MONDAY TO 9 PM
MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER
ZONES 483, 484, 488, 489, 492, 493, 494, 495, 496, 497, AND 498...
* AFFECTED AREA...Fire Weather Zone 483 Southern Ashley National
Forest, Fire Weather Zone 484 Tavaputs Plateau, Fire Weather
Zone 488 Manti National Forest, Fire Weather Zone 489 San
Rafael Swell, Fire Weather Zone 492 Central Utah West Desert,
Fire Weather Zone 493 Central Utah Mountains, Fire Weather
Zone 494 Henry Mountains, Fire Weather Zone 495 Color Country
West Desert, Fire Weather Zone 496 Color Country Mountains,
Fire Weather Zone 497 Mojave Desert and Fire Weather Zone 498
Grand Staircase.
* WINDS...Southwest 10 to 20 mph with gusts to 25 to 35 mph both
Monday and Tuesday afternoons.
* RELATIVE HUMIDITY...Falling into the 5 to 9 percent range each
afternoon with very poor overnight recoveries.
* IMPACTS...Critical fire weather conditions are expected. Any
new fire starts or existing fires may spread rapidly.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions
are either occurring now...or are imminent. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
For more information from the National Weather Service visit
http://weather.gov/saltlakecity
