The synoptic pattern was characterized by strong westerly flow aloft situated across most of the Desert Southwest with embedded shortwave energy providing the main source for rising motion. Above normal moisture was present with PWATs in excess of 1.5 across most of central and southwestern AZ. The available moisture in combination with the daytime heating led to the development of moderate instability  with MLCAPE in excess of 1000 J/KG. The strong westerly flow aloft led to strong vertical shear with 0-6 KM shear values ranging between 30-40 knots. All of these factors led to a very favorable environment for the development of strong to severe thunderstorms across portions of south-central AZ. Scattered thunderstorms started to develop by the early afternoon hours of the 12th with multiple rounds continuing into the evening hours. One severe thunderstorm in particular developed near the Buckeye area, became supercellular, and tracked generally eastward affecting areas such as Goodyear, Glendale, Phoenix, Scottsdale, Mesa and Apache Junction, causing extensive straight-line wind damage along its path. Additional thunderstorms developed just east of the Phoenix metro area during the overnight and early morning hours of the 13th, with the main impact being isolated flash flooding.

Flash Flood in GILA, ARIZONA
From 13-SEP-23 07:30:00 to 13-SEP-23 10:30:00 (MST-7)
Location: ROOSEVELT GRPVN ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spring Creek Wash in Roosevelt was running about 3 feet deep. No damages nor injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: TWIN KNOLLS
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

A couple of mobile homes sustained severe roof damage in the area of East University Drive and Loop 202 in Mesa. Wind gusts were estimated at approximately 80 mph. No injuries were reported.

Hail in MARICOPA, ARIZONA
From 13-SEP-23 06:53:00 to 13-SEP-23 06:53:00 (MST-7)
Location: SCOTTSDALE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail reported in the area of East Thomas Road and Loop 101 in Scottsdale. No damages nor injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: TWIN KNOLLS
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Large trees uprooted along with ceramic tiles on rooftops damaged in the Mountain Bridge Neighborhood located near East McKellips Road in Mesa. Wind gusts were estimated at approximately 80 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:00:00 to 12-SEP-23 21:00:00 (MST-7)
Location: HARMONY VILLA
Magnitude: 70.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple downed power poles and on top of houses in the area of Recker Road between East McDowell Road and East McKellips Road in Mesa. Multiple downed trees were also observed. Wind gusts were estimated at approximately 80 mph. No injuries were reported.

Hail in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: MESA FALCON ARPT
Magnitude: 1.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Photo evidence showed damage to the roofing system as the satellite antenna dish of a home located at 2139 North Recker Road in Mesa. Hailstones were estimated to be up to one inch in diameter. No injuries were reported.

Hail in MARICOPA, ARIZONA
From 12-SEP-23 15:29:00 to 12-SEP-23 15:29:00 (MST-7)
Location: SUN LAKES
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of hailstones of 3/4 inch in diameter near Germann Rd and Dobson Rd.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 15:10:00 to 12-SEP-23 15:10:00 (MST-7)
Location: WEST CHANDLER
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Downed power poles near the area Maricopa Rd and Highway 347 just west of I-10. Traffic signals were out leading to significant traffic impacts. Wind gusts were estimated at approximately 60 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 20:20:00 to 12-SEP-23 20:20:00 (MST-7)
Location: PHOENIX
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Power lines were snapped in the area of North 17th Street and East Oak Street in Phoenix. Wind gusts were estimated at approximately 65-70 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 20:30:00 to 12-SEP-23 20:30:00 (MST-7)
Location: PAPAGO AAF ARPT
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Giant 60 year old pine was uprooted, taking out two block walls as well as a couple power lines in the area of North 66th Street and East Oak Street in Scottsdale. Wind gusts were estimated at 65-70 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 20:30:00 to 12-SEP-23 20:30:00 (MST-7)
Location: PAPAGO AAF ARPT
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A very large uprooted tree fell onto the roof of a home located along the area of North 40th Street and Indian School Road in Phoenix. Tree was estimated to be 90 feet tall with its root system at 13 feet in diameter. Winds were estimated at approximately 65-70 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: HARMONY VILLA
Magnitude: 70.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple large trees were snapped and/or uprooted in the area of North Power and East McKellips Roads in Mesa. Wind gusts were estimated at approximately 80 mph. No injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: CASA GRANDE ARPT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Downed power lines resulting the closure of North Cox Road between West Randolph Road and West McCartney Road in Casa Grande were reported. Wind gusts were estimated at approximately 55-60 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: GOLDEN HILLS
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

An AC unit was blown off the roof of a home located in the area of East Brown and North Power Roads in Mesa and landed on two brand new cars. The unit shattered the windshield of one car and dented the other car. Wind gusts were estimated at approximately 80 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:00:00 to 12-SEP-23 21:00:00 (MST-7)
Location: VELDA ROSE ESTATES
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Home weather station located at 2915 East Minton Road in Mesa recorded a peak wind gust of 81 mph.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 20:30:00 to 12-SEP-23 20:30:00 (MST-7)
Location: PAPAGO AAF ARPT
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A 60 foot pine tree was uprooted and toppled over a home causing damage to the patio roof. Wind gusts were estimated at between 65-70 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 20:50:00 to 12-SEP-23 20:50:00 (MST-7)
Location: VELDA ROSE ESTATES
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Large tree uprooted in the area of Lindsay Road and East McKellips Road in Mesa. Wind gusts were estimated at 65-70 mph. No injuries were reported.

Hail in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: TWIN KNOLLS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Video showed hailstones up to one inch in diameter in the Mountain Bridge Neighbor in Mesa located just east of Loop 202. No damages or injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: MESA FALCON ARPT
Magnitude: 70.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Video showed the roof from a home taken completely apart, flying approximately 100 feet away. Video also showed multiple large trees within the vicinity uprooted. The damage took place in a neighborhood complex located along North Recker Road just north of East McKellips Road in Mesa. Wind gusts were estimated at approximately 80 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 19:45:00 to 12-SEP-23 19:45:00 (MST-7)
Location: LITCHFIELD PARK
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Several large trees estimated to be up to 1 foot in diameter were uprooted in the area of West Indian School Road and North Litchfield Road in Goodyear. Wind gusts were estimated at approximately 60 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 20:30:00 to 12-SEP-23 20:30:00 (MST-7)
Location: SCOTTSDALE
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Local Official

More than 100 trees downed in the city of Scottsdale parks, including 60 in the area of Vista Del Camino and El Dorado Parks. Wind gusts were estimated at approximately 65-70 mph. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 13-SEP-23 04:51:00 to 13-SEP-23 06:51:00 (MST-7)
Location: TORTILLA FLAT
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

State Route 88 between mileposts 229 and 242 southwest of Roosevelt Lake was closed due to flooding and rockslides, making the road impassable. No injuries were reported.

Flash Flood in PINAL, ARIZONA
From 13-SEP-23 06:40:00 to 13-SEP-23 08:40:00 (MST-7)
Location: PALM SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The overflowing from Weekes Wash lead to several road closures in Apache Junction including: Tomahawk Rd. (4th Ave to Junction St.); 4th Ave. (Tomahawk Rd. to Cactus Rd.); Junction St. (Tomahawk Rd. to Wickiup Rd.); and Scenic St. (Vista Rd. to Wickiup Rd.). No damages nor injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 12-SEP-23 14:15:00 to 12-SEP-23 14:15:00 (MST-7)
Location: STANFIELD
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Utility Company

Three downed power poles along West Miller Road about two miles west of Highway 347. Timing based on radar. Wind gusts were estimated at approximately 60 mph. No injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: CASA GRANDE ARPT
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Downed powerlines were reported in the area of North Pinal Avenue and West Val Vista Boulevard in Casa Grande. Wind gusts were estimated at approximately 55-60 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: TWIN KNOLLS
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree approximately 9-11 inches in diameter was uprooted in 8534 East Halifax Circle in Mesa. Wind gusts were estimated at around 60 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:10:00 to 12-SEP-23 21:10:00 (MST-7)
Location: TWIN KNOLLS
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Severe damage occurred at Zaharis Elementary School located at the intersection of East McKellips Road and North Ellsworth Road in Mesa. Significant water damage occurred with several ceiling tiles ripped off as well as downed trees and debris across the campus. School was forced to close down for approximately a week due to the heavy damage. Wind gusts were estimated at approximately 80 mph. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 20:40:00 to 12-SEP-23 20:40:00 (MST-7)
Location: SCOTTSDALE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Tree limb of approximately 6-8 inches in diameter was snapped from a large tree in the area of North Miller Road and East McDowell Road in Scottsdale. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 12-SEP-23 21:00:00 to 12-SEP-23 21:00:00 (MST-7)
Location: VELDA ROSE ESTATES
Magnitude: 78.00 EG
Property damage: 7.20M
Crop damage: 0.00K
Reported by: Broadcast Media

Numerous reports of considerable damage at Falcon Field Airport from a severe microburst. Around 25 airplanes, mostly Cessna small aircraft, were damaged or destroyed, with some flipped over. One aviation flight school lost one third of their fleet, but it is unknown how many aircraft that amounts to. A few pilots reported that even planes with proper tie-downs broke free, with wind eyelets snapping and chains breaking as the planes likely tried to become airborne. Numerous hangars suffered significant damage, with around 90 hangar doors damaged or destroyed. Two World War II era hangars were damaged, with one losing its roof. Another hangar had an entire side wall shorn off. There were several downed trees around the airport, as well as damages to some other airport infrastructure and property, like fencing. A news report nearly three months later stated repairs are still being done and the total damages at the airport is around $7.2 million. An ASOS at Falcon Field Airport did not measure peak wind gusts from this storm due to a loss of power at the airport. Thus, based on damages, winds were estimated around 90 mph. No injuries were reported.