817
WWUS75 KTWC 200451
NPWTWC
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE TUCSON AZ
951 PM MST WED AUG 19 2026
AZZ501-502-504>506-210000-
/O.EXP.KTWC.DU.Y.0009.000000T0000Z-260820T0500Z/
/O.CON.KTWC.XH.W.0006.000000T0000Z-260822T0300Z/
WESTERN PIMA COUNTY-TOHONO O'ODHAM NATION-TUCSON METRO AREA-SOUTH
CENTRAL PINAL COUNTY-SOUTHEAST PINAL COUNTY-
INCLUDING THE CITIES OF TUCSON, PICACHO PEAK STATE PARK, AJO,
ORACLE, MAMMOTH, VAIL, ORGAN PIPE CACTUS N.M., GREEN VALLEY,
MARANA, AND SELLS
951 PM MST WED AUG 19 2026
..BLOWING DUST ADVISORY WILL EXPIRE AT 10 PM MST THIS EVENING
..EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HIGH TEMPERATURES RANGING
BETWEEN 103 TO 110 DEGREES AND LOW TEMPERATURES 79 TO 85 DEGREES.
MAJOR HEATRISK IS EXPECTED.
* WHERE...PINAL COUNTY, TOHONO O'ODHAM NATION, TUCSON METRO AREA, AND
WESTERN PIMA COUNTY.
* WHEN...UNTIL 8 PM MST FRIDAY.
* 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.
AZZ503-200600-
/O.EXP.KTWC.DU.Y.0009.000000T0000Z-260820T0500Z/
UPPER SANTA CRUZ RIVER VALLEY/ALTAR VALLEY-
INCLUDING THE CITIES OF NOGALES
951 PM MST WED AUG 19 2026
..BLOWING DUST ADVISORY WILL EXPIRE AT 10 PM MST THIS EVENING
THE THREAT HAS ENDED.
AZZ509-210000-
/O.CON.KTWC.XH.W.0006.000000T0000Z-260822T0300Z/
UPPER GILA RIVER VALLEY-
INCLUDING THE CITIES OF SAFFORD AND CLIFTON
951 PM MST WED AUG 19 2026
..EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM MST FRIDAY
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HIGH TEMPERATURES RANGING
BETWEEN 103 TO 107 DEGREES AND LOW TEMPERATURES 75 TO 81 DEGREES.
MAJOR HEATRISK IS EXPECTED.
* WHERE...PORTIONS OF GRAHAM AND SOUTHERN GREENLEE COUNTIES INCLUDING
THE UPPER GILA RIVER VALLEY.
* WHEN...UNTIL 8 PM MST FRIDAY.
* 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.
CWR
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