The remnant mid-level circulation of what was Tropical Cyclone Kay was located over southern California. This led to southerly flow across Arizona, which helped increased moisture and instability with moisture values peaking at around 1.5 and MLCAPE values peaking at around 1000 J/KG. Strong to severe thunderstorms developed across southeast Arizona, near the Tucson area, during the late afternoon hours of the 11th and then progressed northward towards the Phoenix metro during the evening hours, resulting in widespread severe downburst winds and blowing dust as well as isolated flash flooding. The Phoenix Sky Harbor Airport reported a peak wind gust of 86 mph at 2053 MST. Additional storms then developed across western Maricopa County, extending into La Paz County, during the early morning hours of the 12th with heavy rainfall leading to flash flooding become the biggest threat.

Dust Storm in NORTHWEST PINAL COUNTY, ARIZONA
From 11-SEP-22 19:19:00 to 11-SEP-22 19:39:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Visibility of less than 1/4 mile reported along I-8 near Stanfield in blowing dust from thunderstorm outflow. No accidents or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 11-SEP-22 21:50:00 to 11-SEP-22 22:50:00 (MST-7)
Location: BOYS RANCH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Local Official

Signal Butte Road between East Germann Road and East Barnes Parkway as well as Germann Road at South Crismon Road were closed due flooding. Timing estimated from radar. No damages or injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 20:24:00 to 11-SEP-22 20:24:00 (MST-7)
Location: CHANDLER ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Chandler Municipal Airport measured a wind gust of 60 mph.

Thunderstorm Wind in PINAL, ARIZONA
From 11-SEP-22 20:46:00 to 11-SEP-22 20:46:00 (MST-7)
Location: DOCK
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Local Official

The City of Queen Creek posted on social media saying to avoid the area of Barnes Parkway and 212th Street due to a tree blown down across the road. Time and wind speed estimated from radar.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 21:10:00 to 11-SEP-22 21:10:00 (MST-7)
Location: TWIN KNOLLS
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Social media pictures showed multiple large tree downed across East Mesa, including one tree falling onto a house. Winds were estimated at around 70 mph. Timing estimated from radar. No injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 11-SEP-22 22:30:00 to 12-SEP-22 00:00:00 (MST-7)
Location: PHOENIX TURF ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

The Flood Control District of Maricopa County Gauge along East Fork Cave Creek Wash near North 7th Avenue in Phoenix indicated water levels rising above alarm stage at 2232 MST, with the flow peaking 3.77 feet (1557 cfs) at 2259 MST, and not going below alarm stage until 2359 MST. This likely made North 7th Avenue impassable. No damages or injuries were reported.

Flash Flood in LA PAZ, ARIZONA
From 12-SEP-22 02:00:00 to 12-SEP-22 08:00:00 (MST-7)
Location: WENDEN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Local Official

Photos from the La Paz County Public Works showed parts of Alamo Road washed out due to extensive flooding from overflowing washes that intersect the road. Timing estimated from radar. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 20:53:00 to 11-SEP-22 20:53:00 (MST-7)
Location: (PHX)SKY HARBOR ARPT
Magnitude: 75.00 MG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: ASOS

Phoenix Sky Harbor Airport ASOS measured a wind gust of 86 mph. This wind gust speed was investigated further as it was considered suspect, however NWS meteorologists determined there was not enough evidence to disprove this measurement. Centerfield winds, a 30 meter wind sensor located just over half a mile north of the ASOS, measured a 76 mph wind gust around the same time as the ASOS. The City of Phoenix Aviation Department shared a report with images that mentioned/showed more than a dozen downed trees, damage to some fencing, cargo containers that were damaged after nearly being blown into a building, at least one downed light pole, and a baggage cart that was blown into and damaged a blast fence. There was also damage to the 24th Street Sky Train station with some broken glass windows at one of the entrances and a small section of outer side paneling that was peeled off. Sky Harbor Airport was in a Ground Stop from 2125MST to 2154MST. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 20:30:00 to 11-SEP-22 20:30:00 (MST-7)
Location: OCOTILLO
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured a 60 mph gust along South Halsted Drive in Sun Lakes.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 20:58:00 to 11-SEP-22 20:58:00 (MST-7)
Location: (CHD)WILLIAMS AFB
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Phoenix-Mesa Gateway Airport measured a wind gust of 75 mph.

Flash Flood in MARICOPA, ARIZONA
From 12-SEP-22 01:50:00 to 12-SEP-22 04:00:00 (MST-7)
Location: AGUILA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Maricopa County Department of Transportation reported that Eagle Eye Road was closed between Aguila Road and Mile Post 0 due to flooding. Timing and location of impacts was adjusted based on radar. There were no reports of damage.

Flash Flood in LA PAZ, ARIZONA
From 12-SEP-22 03:00:00 to 12-SEP-22 09:00:00 (MST-7)
Location: BOUSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

SR-72 at Milepost 25 near Bouse was impassable due to wash flowing over the roadway. Timing estimated from radar. No damages or injuries were reported.

Flash Flood in PINAL, ARIZONA
From 11-SEP-22 21:35:00 to 11-SEP-22 22:35:00 (MST-7)
Location: DOCK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Local Official

The City of Queen Creek posted on social media at 2140MST saying Rittenhouse Road near Ocotillo Road was closed due to flooding. Timing of impacts based around radar. No damages or injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 11-SEP-22 19:42:00 to 11-SEP-22 19:45:00 (MST-7)
Location: BON
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Utility Company

A local utility company reported 4 power poles were downed in a couple locations north of Stanfield. Winds were estimated at around 60 mph. Timing estimated from radar. No injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 11-SEP-22 19:55:00 to 11-SEP-22 19:55:00 (MST-7)
Location: BON
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AK-Chin Regional Airport, located northwest of Casa Grande, measured a wind gust of 58 mph.

Thunderstorm Wind in PINAL, ARIZONA
From 11-SEP-22 21:03:00 to 11-SEP-22 21:03:00 (MST-7)
Location: APACHE JCT
Magnitude: 55.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Social media photo shows a sheet metal car port, that was torn off of a home, wrapped around a tree near Ironwood Drive and Superstition Boulevard. Timing and wind speed estimated based on radar.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 21:15:00 to 11-SEP-22 21:15:00 (MST-7)
Location: VELDA ROSE ESTATES
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The Mesa Falcon Field Airport measured a wind gust of 58 mph.

Dust Storm in SOUTH MOUNTAIN/AHWATUKEE, ARIZONA
From 11-SEP-22 20:25:00 to 11-SEP-22 20:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Visibility of less than 1/4 mile reported along East Ray Road in the Ahwatukee Foothills in blowing dust from thunderstorm outflow. No accidents or injuries were reported.

Dust Storm in EAST VALLEY, ARIZONA
From 11-SEP-22 20:30:00 to 11-SEP-22 20:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Visibility of less than 1/4 mile reported in the intersection of Baseline Road and Rural Road in Tempe in blowing dust from thunderstorm outflow. No accidents or injuries were reported.

Thunderstorm Wind in PINAL, ARIZONA
From 11-SEP-22 19:57:00 to 11-SEP-22 20:00:00 (MST-7)
Location: LIRIM
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Utility Company

A local utility company reported 2 downed power poles in 2 locations east of Maricopa. Winds were estimated around 60 mph. Timing estimated from radar. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 21:10:00 to 11-SEP-22 21:10:00 (MST-7)
Location: TWIN KNOLLS
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

A large uprooted tree fell onto a couple of cars along South Ellsworth Road between East Southern Avenue and East Broadway Road in East Mesa. There were also reports of many damaged or destroyed sheet metal car ports in the area. A small metal shed was also thrown and destroyed. Winds were estimated at around 70 mph. Timing estimated from radar. No injuries were reported.

Thunderstorm Wind in MARICOPA, ARIZONA
From 11-SEP-22 21:18:00 to 11-SEP-22 21:18:00 (MST-7)
Location: PHOENIX
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Social media picture showed large tree uprooted against a 3 three story apartment complex in the area of North 16th street and Camelback Road. Winds were estimated at around 70 mph. Timing estimated from radar. No injuries were reported.