High pressure across the southern Plains and low pressure across the Great Basin led to a southerly flow across the region, advecting deep moisture. PWATs rose to 2, which was near record for the period, and with the increased moisture instability values also rose with MLCAPE values in excess of 2,000 J/KG. The forcing from the aforementioned low pressure helped to enhance the thunderstorm activity as it was moving from south to north.

Flash Flood in PINAL, ARIZONA
From 21-SEP-22 17:49:00 to 21-SEP-22 22:00:00 (MST-7)
Location: MOBILE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Video showed Arizona Department of Public Safety performed a swift water rescue by air around 2100MST. A family of 6 (2 parents and 4 kids) in an SUV were washed off of Val Vista Road near Warren Road at a low water crossing with Vekol Wash. Floodwaters were over the hood of the SUV after being pushed downstream. All 6 individuals were safely rescued from the roof of their vehicle and were unharmed. A Flood Control District of Maricopa County Gauge on Vekol Wash near I-8, located approximately 14 miles southwest, showed the flow going above alarm stage at 1340 MST, peaking at 7.80 feet (2465 cfs) at 1540 MST, and returning below alarm stage at 1754 MST. A news article mentioned this was the second swift water rescue performed in a matter of a few hours. Details on the other rescue were not found.

Flash Flood in MARICOPA, ARIZONA
From 21-SEP-22 09:00:00 to 21-SEP-22 12:00:00 (MST-7)
Location: WITTMANN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Video from broadcast of media showed water and debris flowing over roadway off of Grand Ave & Jomax near Wittman. Timing estimated from radar. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 21-SEP-22 09:00:00 to 21-SEP-22 12:00:00 (MST-7)
Location: HASSAYAMPA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Baseline Rd in the Palo Verde region was closed between Johnson Rd and 331st Ave due to flooding. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 21-SEP-22 11:24:00 to 21-SEP-22 16:37:00 (MST-7)
Location: ARLINGTON
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 Centennial Wash near the Railroad area reached action stage at 954 MST, with a peak flow of 10.12 feet (1341 cfs) at 1112 MST. Flash Flood impacts downstream where Centennial Wash crosses old U.S. 80 occurred 1.5 hours after action stage was reached, which is 6 miles downstream of the gauge. The flow returned below alarm stage at 1507 MST. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 21-SEP-22 14:00:00 to 21-SEP-22 17:00:00 (MST-7)
Location: GILA BEND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

SR-238 closed between Milepost 4 and 24 due to flooding. No damages or injuries were reported.

Flash Flood in PINAL, ARIZONA
From 21-SEP-22 17:53:00 to 22-SEP-22 03:50:00 (MST-7)
Location: LIRIM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Ralston Road at the Vekol Wash low water crossing in Ak-Chin Village was flooded and was impassable for several hours. Peak floodwater height was measured at nearly 7 feet at around 1951 MST by the Pinal County Flood Control gauge at the crossing. Timing estimated based off when the water level first reached 1 feet deep. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 21-SEP-22 09:00:00 to 21-SEP-22 12:00:00 (MST-7)
Location: BUCKEYE MUNI ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Tonopah Salome Highway in Tonopah was closed between 315th Ave and 327th Dr due to flooding. No damages or injuries were reported.

Flash Flood in MARICOPA, ARIZONA
From 21-SEP-22 09:00:00 to 21-SEP-22 12:00:00 (MST-7)
Location: WINTERSBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Salome Hwy between 331st Ave to 355th Ave was closed due to flooding. No damages or injuries were reported.