Thunderstorms developed during the afternoon and moved northwest across southeast Arizona through the evening. Storms produced damaging winds and large hail across eastern Pima County and the Tohono O'odham Nation and a dust storm in Pinal County. The Catalina Foothills were especially hit hard with numerous power poles downed leaving thousands without power for two days.

Thunderstorm Wind in PIMA, ARIZONA
From 17-JUL-23 16:34:00 to 17-JUL-23 16:55:00 (MST-7)
Location: (DMA)DAVIS MONTHAN A
Magnitude: 61.00 EG
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A thunderstorm wind gust of 58 mph was measured at KDMA ASOS at 1634MST. A spotter recorded a gust to 68 mph near Speedway and Harrison at 1635MST and a gust to 63 mph was measured at KTUS ASOS at 1638MST.  In the Catalina Foothills from River/Swan to Skyline/Campbell numerous trees were downed, some of which fell on parking structures, vehicles and apartment buildings.  Around 7500 customers were without power due to 30 power poles being downed. Winds peeled parts of roofs off a handful of houses.

Thunderstorm Wind in PIMA, ARIZONA
From 17-JUL-23 15:30:00 to 17-JUL-23 15:30:00 (MST-7)
Location: LAS GUIJAS
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

A thunderstorm wind gust to 62 mph was measured at the Sasabe RAWS site.

Hail in PIMA, ARIZONA
From 17-JUL-23 16:00:00 to 17-JUL-23 16:00:00 (MST-7)
Location: HAIVANA NAKYA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PIMA, ARIZONA
From 17-JUL-23 16:29:00 to 17-JUL-23 16:31:00 (MST-7)
Location: SABINO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Two NWS employees reported quarter size hail on Tucson's east side.

Thunderstorm Wind in PIMA, ARIZONA
From 17-JUL-23 16:48:00 to 17-JUL-23 17:45:00 (MST-7)
Location: EMERY PARK
Magnitude: 61.00 EG
Property damage: 70.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused extensive damage to the Fitness Center at the Pima Community College Desert Vista campus. Several trees were downed in Oro Valley. A wind gust to 60 mph was measured at the KAVQ AWOS at 1745MST.

Thunderstorm Wind in PIMA, ARIZONA
From 17-JUL-23 17:55:00 to 17-JUL-23 17:55:00 (MST-7)
Location: GU ACHI
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Tribal Official

Thunderstorm winds downed a power pole near Santa Rosa.

Flash Flood in PIMA, ARIZONA
From 17-JUL-23 17:30:00 to 17-JUL-23 18:30:00 (MST-7)
Location: SABINO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Around 1.5 of rain in less than 1 hour caused flash flooding of roadways in the Catalina Foothills of Tucson from Sunrise and Swan to River and Alvernon.

Thunderstorm Wind in PIMA, ARIZONA
From 17-JUL-23 16:00:00 to 17-JUL-23 16:00:00 (MST-7)
Location: MARSH
Magnitude: 56.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Utility Company

Thunderstorm winds downed two power poles near Miller Ranch Rd northeast of Vail.

Dust Storm in SOUTH CENTRAL PINAL COUNTY, ARIZONA
From 17-JUL-23 17:46:00 to 17-JUL-23 18:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Thunderstorm outflow winds caused a wall of dust to travel northwest across south central Pinal County. ADOT sensors detected blowing dust reducing visibilities to less than a quarter mile along I-10 from Picacho Peak to Eloy.