Strong to severe thunderstorms developed in an unstable atmosphere in the afternoon of the 22nd. Storms initially developed over the high terrain of northern and eastern Arizona as well as near the Table Top mesa area south of Phoenix. High DCAPE promoted strong thunderstorm downbursts. The downbursts generated outflows that progressed into the greater Phoenix metro area and led to the development of additional scattered thunderstorm. The thunderstorms in the metro area produced damaging winds that led to numerous downed trees, downed power poles, and other property damage. The storms were also nearly stationary, under weak steering flow, and produced very heavy rainfall with rain rates around 1.5-2.0 inches per hour and briefly higher in the strongest storms. This led to considerable flash flooding around Phoenix with several road closure and significant flow in major washes. Even after the strongest storms in Phoenix subsided in the late evening of the 22nd, areas of moderate to heavy rain continued from northeast to southwest through the night and through mid-afternoon on the 23rd. The continued rain through the 23rd was aided by a strengthening diffluent flow regime between the monsoon high to the north and a retrograding upper low moving west through New Mexico. Additional significant flash flooding was observed on the 23rd, mostly in the foothills north of the Phoenix metro, with many road closures, flowing washes and creeks, and some water rescues.

Flash Flood in PINAL, ARIZONA
From 22-JUL-21 20:35:00 to 22-JUL-21 20:50:00 (MST-7)
Location: ARIZONA CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Social media video showed water flowing over Sunland Gin Road near Tonto Road. Time estimated from radar rainfall estimates. No damages or injuries reported.

Flash Flood in MARICOPA, ARIZONA
From 22-JUL-21 22:14:00 to 23-JUL-21 00:00:00 (MST-7)
Location: PHOENIX TURF ARPT
Flood cause: Heavy Rain
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Thunderbird Road underpass at Interstate-17 became impassable with 2 to 3 feet of standing water after over 1 inch of rain fell in roughly one hour. One vehicle stalled in the flood water and had to be towed out. The road was eventually closed. No injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 22-JUL-21 20:05:00 to 22-JUL-21 20:05:00 (MST-7)
Location: PHOENIX DEER VLY ARP
Magnitude: 48.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Social media photos and videos show several downed palo verde trees of varying sizes along Pinnacle Peak Road near 35th Avenue. Some of the palo verdes fell into the road. Timing estimated from radar. No injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 22-JUL-21 21:25:00 to 22-JUL-21 21:25:00 (MST-7)
Location: PAPAGO AAF ARPT
Magnitude: 70.00 EG
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Broadcast Media

A microburst caused considerable damage from the McCormick Rach area and down to Scottsdale Road and McDonald Road with hundreds of downed trees and several downed power poles that caused a power outage to the area. The McCormick Ranch golf course had at least 220 large trees uprooted or snapped across the property. Several trees also fell on homes around the course. Course officials estimated the damage costs to the course at $600,000. At a shopping plaza on the southwest side of the course a palm tree fell onto a business, causing damage to the roof. Across Indian Bend Road to the south, McCormick-Stillman Railroad Park received extensive damage with several large trees, including pines, being uprooted or snapped across the park. Some of the toppled trees fell on park buildings and trains. At least 6 power poles were downed or snapped due to the winds with most of the poles along Scottsdale Road between Lincoln Drive and McDonald Drive. In this area 5 large trees were also uprooted with a couple of them being pine trees. Winds were estimated around 70-80 mph based on damage. Timing estimated from radar. There were no injuries.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 12:50:00 to 23-JUL-21 13:10:00 (MST-7)
Location: NEW RIVER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The Flood Control District of Maricopa County streamflow gage on Cline Creek near Jenny Lin Road and 12th Street exceeded alarm stage at 1250MST and bank full at 1254MST. Flow crested at 6.9 feet at 1255MST and fell back below alarm stage at 1307MST. No injuries or damages were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 22-JUL-21 21:10:00 to 22-JUL-21 21:10:00 (MST-7)
Location: PAPAGO AAF ARPT
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A microburst caused significant damage in south Scottsdale with numerous downed trees of various sizes and with some falling on parked vehicles. At Scottsdale Road and Thomas Road one tree fell on top of two cars, damaging the frame and busting the window of one. Nearby at Thomas and 70th Street a carport at an apartment complex was destroyed with a portion of it collapsing on a parked SUV. Winds estimated around 60 mph based on damage reports in the affected area. Timing estimated from radar. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 14:00:00 to 23-JUL-21 18:00:00 (MST-7)
Location: NEW RIVER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Skunk Creek experienced a significant rise after 2 to 4 inches of rain fell over the area and upstream. At 1400MST the the streamflow gage on Skunk Creek at Carefree Highway exceeded alarm stage. The gage then exceeded bank full at 1410MST and exceeded flood stage at 1418MST. Flow crested at 6.87 feet at 1426MST and would remain above alarm stage until 1715MST. A video posted at 1307MST on social media showed significant flow and debris over Dove Valley Road between I-17 and North Valley Parkway. Maricopa County Department of Transportation reported 27th Avenue was closed between Cloud Road and Dolores Road. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 12:38:00 to 23-JUL-21 16:31:00 (MST-7)
Location: NEW RIVER
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Two people had to be rescued from their mobile home near Central Avenue and Mingus Road after flood waters rapidly overcame the area. Water was reportedly flowing through their windows and there was concern that the home would flow away. They were rescued via helicopter because responders were unable to reach the home on the ground with multiple impassable flooded roads. Rain gages in the area measured over 1.5 inches of rain in less than an hour The two people were uninjured, but their two dogs did not survive.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 13:15:00 to 23-JUL-21 18:30:00 (MST-7)
Location: NEW RIVER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A Flood Control District of Maricopa County streamflow gage along Skunk Creek at Desert Hills Drive exceeded alarm stage around 1315MST and bank full around 1325MST. Streamflow crested around 5.81 feet at 1329MST and was back below action stage by 1800MST. At 1805MST Maricopa County Department of Transportation reported 19th Avenue was closed between Desert Hills Drive and Irvine Road due to flooding. No damages or injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 22-JUL-21 16:00:00 to 22-JUL-21 16:00:00 (MST-7)
Location: GILA BEND
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

Multiple RVs were damaged or displaced after strong to severe winds impacted the Sonoran Desert RV Park. 10 RVs were moved 5 to 6 feet and one was knocked over on its side. Additionally, one RV had windows broken and another had a cracked glass door. Winds estimated based on damage and timing based on radar. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 10:00:00 to 23-JUL-21 10:20:00 (MST-7)
Location: CACTUS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Hatcher Road was closed due to flooding between 11th Street and 11th Place. Nearby rain gages measured from 0.25 to 1.10 inches. Time estimated from radar and rain gages. No damages or injuries reported.

Lightning in MARICOPA, ARIZONA
From 22-JUL-21 21:30:00 to 22-JUL-21 21:30:00 (MST-7)
Location: CACTUS
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a house and sparked a fire in in the attic. No one was home at the time of the strike. Fire crews were able to keep the damage at a minimum. Time estimated from radar. No injuries reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 11:45:00 to 23-JUL-21 14:00:00 (MST-7)
Location: FT MCDOWELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A little over 1 inch of rain fell in roughly 1 hour east of Cave Creek between 1000MST and 1100MST. Light to moderate rain was falling beforehand and continue to fall through the early afternoon. Maricopa County Department of Transportation reported at 1335MST that Needlerock Road north of Rio Verde Drive was closed due to flooding. No injuries or damage was reported.

Flash Flood in MARICOPA, ARIZONA
From 22-JUL-21 21:50:00 to 23-JUL-21 02:40:00 (MST-7)
Location: SCOTTSDALE
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Very heavy rain fell in the Scottsdale area beginning around 2100MST on the 22nd. A rain gage at Indian School Road and Indian Bend Wash measured a little over 2 inches in 50 minutes. A significant amount of runoff collected in Indian Bend Wash that flooded multiple low water road crossings as well as flooded recreational parks built in the wash. Osborn Road across the wash was impassable with roughly 2 feet of moving water over the road. One vehicle became stuck trying to cross the flood waters and had to be rescued by the fire department. A flood control streamflow gage on Indian School Road, a block north, exceeded alarm stage at 2146MST on the 22nd and did not fully recede below alarm stage until 0239MST on the 23rd. Helicopter footage after sunrise on the 23rd still showed minor levels of flooding in the wash. No injuries were reported.

Flash Flood in GILA, ARIZONA
From 23-JUL-21 00:15:00 to 23-JUL-21 00:35:00 (MST-7)
Location: GOVERNMENT HILL
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Arizona Department of Transportation closed Highway-188 between mile posts 246 and 253 due to flooding with an overtopped drainage cut and debris on the road. Runoff may have been enhanced by the 2020 Bush burn scar. Timing estimated from radar. No damages or injuries were reported.

Flash Flood in PINAL, ARIZONA
From 22-JUL-21 20:35:00 to 22-JUL-21 20:50:00 (MST-7)
Location: ARIZONA CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash flooding reported near a truck stop at Sunland Gin Road and Interstate-10. Water was a few feet deep in spots. Timing estimated from radar rainfall estimates. No damages or injuries reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 15:00:00 to 23-JUL-21 16:30:00 (MST-7)
Location: CAREFREE
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

U.S. Forest Service reported a 4 foot rise in Camp Creek with flow originating from the Sears burn scar. Time estimated from radar. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 22-JUL-21 22:21:00 to 23-JUL-21 00:00:00 (MST-7)
Location: PHOENIX TURF ARPT
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Arizona Department of Transportation reported the Greenway Road underpass at Interstate-17 was flooded and the on/exit ramps were also under water. A couple vehicles became stranded in the flood water. This forced the closure of the underpass. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 11:10:00 to 23-JUL-21 12:40:00 (MST-7)
Location: FOUNTAIN HILLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rain fell in Fountain Hills with a few rain gages measuring a little over 1 inch in an hour. Rapid runoff led to significant flow in Ashbrook Wash. Social media videos showed at least 6-12 inches of swift moving water over Fountain Hills Boulevard near Ashbrook Drive as well as over Del Cambre Avenue near Grande Boulevard. The roads were impassable to all traffic. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 14:10:00 to 23-JUL-21 16:45:00 (MST-7)
Location: NEW RIVER
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

A streamflow gage on New River near Table Mesa Road exceeded alarm stage at 1404MST, bank full at 1419MST, and flood stage at 1422MST. The flood wave crested at 7.88 feet at 1426MST and remained above alarm stage until 1620MST. Three individuals were rescued by Maricopa County Sheriff's Office via helicopter after their SUV stalled in the flood waters near Table Mesa Road. A low water crossing roughly 7 miles downstream along Old Stage Road, north of New River Road, experienced significant flow and the road had to be closed. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 22-JUL-21 20:15:00 to 22-JUL-21 20:15:00 (MST-7)
Location: PHOENIX DEER VLY ARP
Magnitude: 48.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Photo of a large shallow-rooted tree that fell between two homes near 29th Avenue and Deer Valley Road and caused minor damage to both. Timing estimated from radar. No injuries reported.

Flash Flood in GILA, ARIZONA
From 23-JUL-21 02:00:00 to 23-JUL-21 02:30:00 (MST-7)
Location: MIAMI
Flood cause: Heavy Rain / Burn Area
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A local bridge along Mackey Camp Road reportedly washed out following a rapid rise in flood waters in Bloody Tanks Wash. Runoff may have been enhanced by the 2021 Telegraph burn scar. Timing based on upstream rain gage and radar. No injuries reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 12:50:00 to 23-JUL-21 18:00:00 (MST-7)
Location: NEW RIVER
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Very heavy rain fell in the afternoon with over 2 inches measured in the Anthem and New River area with radar estimates up to 4 inches over the New River Mesa between 1200MST and 1400MST. A social media video taken around 1400MST showed a few feet of rapid moving water running within Skunk Creek with an unoccupied SUV flowing downstream near Fig Springs Road. Timing of when flooding began estimated from radar and streamflow gages. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 13:30:00 to 23-JUL-21 17:30:00 (MST-7)
Location: CAVE CREEK
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Video from Maricopa County Sheriff's Office showed two individuals being rescued via helicopter from the roof of a delivery truck that became stranded in a flooded wash near 7th street and Cloud Road. The two individuals were uninjured. The chopper footage also showed at least one home with roughly 1 to 2 fee of water surrounding it. No additional info provided on any impacted homes. Another video near 12th Street and Carefree Highway showed several inches of water flowing down 12th Street. An individual had to be rescued from their car after it became stranded in the flood water. The individual was uninjured, but the vehicle was lost.

Flash Flood in MARICOPA, ARIZONA
From 23-JUL-21 13:05:00 to 23-JUL-21 18:15:00 (MST-7)
Location: NEW RIVER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Significant flood water moving downstream within Skunk Creek led to the closure of the low water crossing along Honda Bow Road between 7th Avenue and 9th Avenue. Time estimated from streamflow gages and radar. No damages or injuries reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 22-JUL-21 21:20:00 to 22-JUL-21 21:20:00 (MST-7)
Location: PAPAGO AAF ARPT
Magnitude: 56.00 EG
Property damage: 300.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A microburst caused significant damage in Downtown Scottsdale with numerous toppled or snapped trees. Amongst the received reports, half a dozen trees were reportedly uprooted around Fashion Square outlet mall. At least a couple trees fell on vehicles. Two palm trees in front of the Galleria Corporate Center were snapped in half. A carport at the San Marin apartment complex was blown over and caused damage to the several cars parked underneath. A media report showed a restaraunt had a partial roof torn off while customers were inside. In all there were like many more unreported damages with unkown costs. Winds were estimated around 60-65 mph in the downtown area based on damage. Timing estimated from radar. No injuries were reported.