Under a classic setup for storm motion from the Mogollon Rim to the Valley (Rim-to-Valley), with the monsoon 500mb high positioned over Nevada, a multicell storm cluster descended out of the White Mountains, through Gila County, and into the lower deserts of Maricopa and Pinal Counties in the early overnight hours of the 1st. Moisture levels were near average for the time of year, but steep mid level lapse rates over the high terrain (7-8 C/km) and modest shear (Sfc-6km around 20-25 kts) was sufficient to support the development of an organized multicell storm cluster. The environment was also supportive of strong downbursts, with DCAPE up around 1000-1500 J/kg. A single ordinary storm also developed in the Queen Creek/San Tan Valley area a couple hours before the multicell cluster moved into the lower deserts, and produced a damaging downburst. Strong winds leading to a dust storm was eventually generated by the multicell cluster once it moved into Maricopa and Pinal Counties.

Dust Storm in SOUTHEAST VALLEY/QUEEN CREEK, ARIZONA
From 01-SEP-22 22:14:00 to 01-SEP-22 22:25:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Visibility fell to 200 feet near Queen Creek Road and Sossaman Road due to dense blowing dust. No injuries or major traffic disruptions were reported.

Dust Storm in NORTHWEST PINAL COUNTY, ARIZONA
From 01-SEP-22 22:37:00 to 01-SEP-22 22:50:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

An Arizona Department of Transportation traffic web cam at the intersection of State Route 347 and Cement Plant Road showed near zero visibility in blowing dust. No injuries or significant impacts to traffic were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 01-SEP-22 20:36:00 to 01-SEP-22 20:36:00 (MST-7)
Location: MAGMA
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Two large trees (20-24 inch diameter trunks) were uprooted and each fell through concrete block walls and onto a couple homes in the Johnson Ranch community. The extent of the damage to the homes was unknown. There were also several street signs reportedly ripped from their posts or were twisted/mangled. Winds were estimated around 55-60 mph and timing was based on radar. No injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 01-SEP-22 20:34:00 to 01-SEP-22 20:34:00 (MST-7)
Location: MAGMA
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A bus barn at Poston Butte High School had two 3X70 foot pieces of sheet metal roofing peeled off in a downburst. A stack of wooden pallets was reportedly tossed 150 feet and there was at least minor damage to other equipment and supplies. A light pole, rusted near the base, also toppled over at the high school. Wind speeds estimated around 55-60 mph and timing based on radar. No injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 01-SEP-22 20:35:00 to 01-SEP-22 20:35:00 (MST-7)
Location: MAGMA
Magnitude: 52.00 EG
Property damage: 6.00K
Crop damage: 0.00K
Reported by: Public

Approximately 5-6 trees, at 20 to 30 feet tall, were toppled on Johnson Ranch Boulevard. Wind speeds estimated around 55-60 mph and timing estimated from radar. No injuries were reported.