A shortwave trough moving across the state promoted the development of convection over portions of Maricopa County during the afternoon on the 15th. With anomalously high amounts of moisture in place along with high instability, thunderstorms were capable of producing strong winds and locally heavy rainfall, which led to some reports of flash flooding.

Thunderstorm Wind in MARICOPA, ARIZONA
From 15-JUL-21 14:55:00 to 15-JUL-21 14:55:00 (MST-7)
Location: BEARDSLEY
Magnitude: 43.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The City of Surprise emergency manager reported 20 trees down in multiple locations along Sunrise Boulevard between Remington Drive and Mountain View Boulevard. Radar estimated winds were between 40-50 mph at the time, which is consistent with a 48 mph gust measured by a mesonet station, MAMD, at 1.9 miles W of Beardsley. No injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 15-JUL-21 14:55:00 to 15-JUL-21 14:55:00 (MST-7)
Location: BEARDSLEY
Magnitude: 43.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

City of Surprise emergency manager reported 15 trees were blown down along Reems Road near Mountain View Boulevard. Radar estimated winds were between 40-50 mph. Timing estimated from radar. No injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 15-JUL-21 17:15:00 to 15-JUL-21 17:15:00 (MST-7)
Location: HARMONY VILLA
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Video on social media showed a tree blew over and blocked Power Road near McKellips Road. Winds were estimated around 55-60 mph. Timing estimated from radar.

Thunderstorm Wind in MARICOPA, ARIZONA
From 15-JUL-21 17:10:00 to 15-JUL-21 17:10:00 (MST-7)
Location: APACHE WELLS
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station SRP10 at 6.5 miles N of EAST MESA measured a wind gust of 61 mph.

Flash Flood in MARICOPA, ARIZONA
From 15-JUL-21 16:00:00 to 15-JUL-21 16:15:00 (MST-7)
Location: FENNEMORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

City of Surprise closed Sarival Avenue between Peoria Avenue and Mescal Street due to flooding. No damages or injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 15-JUL-21 17:12:00 to 15-JUL-21 17:12:00 (MST-7)
Location: DREAMLAND VILLA
Magnitude: 63.00 MG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: ASOS

ASOS station at Mesa Falcon Filed airport (KFFZ) measured a 72 mph wind gust from a microburst. At least one Cessna aircraft at the airport was flipped over. The aircraft presumably also hit and destroyed a double door to a hangar. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 15-JUL-21 17:12:00 to 15-JUL-21 17:12:00 (MST-7)
Location: HARMONY VILLA
Magnitude: 61.00 EG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Multiple homes endured significant roof damage in the Apache Wells community in East Mesa. At one residence, a carport ripped away from a residence, pulling a large portion of the roof with it, and blew into the street in front of the residence. At least 25 homes in total in the Apache Wells community reportedly suffered some form of wind damage. Two 50 foot tall trees on the Apache Wells golf course were uprooted with each falling on two separate homes. The full extent of the damage to the homes is unknown. One of the trees reportedly fell due to storms on the 10th. A 72 mph wind gust was measured at Falcon Field airport across the street. Timing based on wind gust at Falcon Field. No injuries reported.

Flash Flood in MARICOPA, ARIZONA
From 15-JUL-21 16:00:00 to 15-JUL-21 16:15:00 (MST-7)
Location: WADDELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

City of Surprise closed Cactus Road between Sarival Avenue and Reems Road due to flooding. A semi-truck overturned on Cactus Road around this time, believed by first responders to be due to wind and possibly exacerbated by the water on the road. No damages or injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 15-JUL-21 14:40:00 to 15-JUL-21 14:40:00 (MST-7)
Location: WADDELL
Magnitude: 48.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A semi-truck overturned on Cactus Road between Sarival Avenue and Reems Road. First responders reported the incident was believed to have been due to strong winds and exacerbated by the wet road. Winds were estimated around 45-55 mph based on radar. Timing estimated from radar. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 15-JUL-21 15:35:00 to 15-JUL-21 15:50:00 (MST-7)
Location: FENNEMORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

City of Surprise closed Cotton Lane between Peoria Avenue and Cactus Road due to flooding. A video on social media showed at least 6 inches of water flowing over Cotton Lane. No damages or injuries reported.