High pressure aloft strengthened over Arizona and created a period of very hot temperatures August 4-6 across southeast Arizona. High temperatures were 8 to 13 degrees above normal causing the Major Heat Risk category to be reached and numerous high temperature records to be established. A total of nine heat-related fatalities were reported by the Pima County Medical Examiner.

Excessive Heat in SOUTHEAST PINAL COUNTY, ARIZONA
From 01-AUG-23 10:00:00 to 03-AUG-23 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Very hot temperatures up to 10 degrees above normal caused the Major Heat Risk category to be reached across western Pima County and southern Pinal County August 4-6. A record high of 107 degrees occurred at San Manuel on August 5. Other high temperatures included 112 at Ajo on August 4 and 5; 110 at Picacho Peak on all three days; and 109 at Ajo on August 4.

Excessive Heat in WESTERN PIMA COUNTY, ARIZONA
From 01-AUG-23 10:00:00 to 03-AUG-23 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Very hot temperatures up to 10 degrees above normal caused the Major Heat Risk category to be reached across western Pima County and southern Pinal County August 4-6. A record high of 107 degrees occurred at San Manuel on August 5. Other high temperatures included 112 at Ajo on August 4 and 5; 110 at Picacho Peak on all three days; and 109 at Ajo on August 4.

Excessive Heat in SOUTH CENTRAL PINAL COUNTY, ARIZONA
From 01-AUG-23 10:00:00 to 03-AUG-23 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Very hot temperatures up to 10 degrees above normal caused the Major Heat Risk category to be reached across western Pima County and southern Pinal County August 4-6. A record high of 107 degrees occurred at San Manuel on August 5. Other high temperatures included 112 at Ajo on August 4 and 5; 110 at Picacho Peak on all three days; and 109 at Ajo on August 4.

Excessive Heat in TOHONO O ODHAM NATION, ARIZONA
From 04-AUG-23 10:00:00 to 06-AUG-23 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Very hot temperatures of 8 to 13 degrees above normal caused the Major Heat Risk category to be reached across the Tohono O'odham Nation, southeast Pima County, and  the lower elevations of Santa Cruz County August 4-6. Record highs at Sells included 109 degrees on August 4 and 5; and 107 at Nogales on August 5. The Pima County Medical Examiner determined that heat was the primary cause of death for four individuals found in the desert during the period; one northwest of Tubac on the 4th and three others on the Tohono O'odham Nation on the 5th in the Sells and Topawa areas.

Excessive Heat in UPPER SANTA CRUZ RIVER AND ALTAR VALLEYS, ARIZONA
From 04-AUG-23 10:00:00 to 06-AUG-23 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Very hot temperatures of 8 to 13 degrees above normal caused the Major Heat Risk category to be reached across the Tohono O'odham Nation, southeast Pima County, and  the lower elevations of Santa Cruz County August 4-6. Record highs at Sells included 109 degrees on August 4 and 5; and 107 at Nogales on August 5. The Pima County Medical Examiner determined that heat was the primary cause of death for four individuals found in the desert during the period; one northwest of Tubac on the 4th and three others on the Tohono O'odham Nation on the 5th in the Sells and Topawa areas.

Excessive Heat in TUCSON METRO AREA, ARIZONA
From 04-AUG-23 10:00:00 to 06-AUG-23 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Very hot temperatures of 8 to 11 degrees above normal caused the Major Heat Risk category to be reached across the Tucson Metro area August 4-6. Record highs at Tucson International Airport included 109 degrees on August 4 and 110 on August 5. The Pima County Medical Examiner determined that heat was the primary cause of death for one individual who was walking outdoors on the 5th. Heat was found to be a contributing factor in the death of four individuals. Two were found outdoors and also experienced a complicating factor of drug toxicity. Two were found indoors with a nonfunctioning or nonexistent AC unit and had complicating factors of drug toxicity or another health condition.