High pressure situated south of the International Border led to a westerly flow aloft, which caused dry air advection. However, there was still sufficient moisture (PWAT around 1.5 inches) and instability (MLCAPE 1000-2000 J/KG) as well as a subtle disturbance in the upper-levels to result in the development of strong thunderstorms across portions of south-central and southwest Arizona. Downdraft CAPE values were also in excess of 1500 J/KG, which led to favorable conditions for some of these thunderstorms to produce severe wind gusts.

Avalanche in CENTRAL LA PAZ, ARIZONA
From 27-AUG-22 16:00:00 to 27-AUG-22 16:20:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Visibility of near zero reported for a couple of miles near the area of I-10 and Vicksburg Road. No accidents or injuries were reported.

Flash Flood in PINAL, ARIZONA
From 27-AUG-22 18:00:00 to 27-AUG-22 20:00:00 (MST-7)
Location: QUEEN VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Video of flash flooding on Peralta Road, east of Gold Canyon, which stranded motorists. Timing estimated from radar. No damages or injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-22 13:05:00 to 27-AUG-22 13:05:00 (MST-7)
Location: WITTMANN
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous downed trees with diameters ranging from 6-24 inches in the area of West Beardsley Parkway and North Desert Oasis Boulevard in Sun City Festival. Winds were estimated at around 60 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-22 13:15:00 to 27-AUG-22 13:15:00 (MST-7)
Location: WITTMANN
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees were knocked down with trunk diameters ranging from 6-12 inches along the area of Sun Valley Parkway and North Desert Oasis Boulevard in Sun City Festival. Winds were estimated at around 60 mph. No injuries were reported.

Dust Storm in CENTRAL LA PAZ, ARIZONA
From 27-AUG-22 16:00:00 to 27-AUG-22 16:20:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Visibility of near zero reported for a couple of miles near the area of I-10 and Vicksburg Road. No accidents or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 27-AUG-22 16:50:00 to 27-AUG-22 20:30:00 (MST-7)
Location: AGUILA
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

A Flood Control District of Maricopa County Stream Gauge of Jackrabbit Wash at Vulture Mine Road reported water levels rising rapidly above alarm stage at around 1713 MST, with a peak flow of 4.88 feet (3651 cfs) at 1803 MST, and going back down below alarm stage at around 1926 MST. This amount of water flow likely flooded Aguila Road upstream of the gauge and Wickenburg Road, where a water rescue was performed, located 5 miles downstream of the gauge. No injuries were reported. Based on the report from the Phoenix Dispatch, water got halfway up on an unoccupied vehicle stuck along the flood waters from Jackrabbit Wash located along Wickenburg Road.

Thunderstorm Wind in MARICOPA, ARIZONA
From 27-AUG-22 15:48:00 to 27-AUG-22 15:48:00 (MST-7)
Location: HIGLEY
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Numerous downed trees (10+) along the area of Higley and Germann Roads in Gilbert. Timing estimated from radar. Winds were estimated at around 60 mph. No injuries were reported.