Multiple rounds of thunderstorms developed and moved across southeast Arizona from mid morning of August 16 through the early evening of August 17. Individual storms produced heavy rain of 1 to 2 inches per hour, but some locations where multiple thunderstorm events occurred received 3 to 4 inches of rain during the period. The result was numerous reports of flash flooding, road closures and swift water rescues, especially in Pima and Cochise counties. Longer term flooding occurred in the Brawley Wash and downstream in Greene Wash. Damage from thunderstorm winds and lightning also occurred in the Tucson Metro.

Flash Flood in PINAL, ARIZONA
From 17-AUG-21 01:00:00 to 17-AUG-21 02:30:00 (MST-7)
Location: AVRA
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 0.00K
Reported by: County Official

One to two inches of rain in less than an hour caused flash flooding in south central Pinal County. Considerable damage occurred to Park Links Rd. between Cattle Tank Rd. and the I-10 Frontage Rd. McClellan Wash also flooded Milligan Rd. resulting in its closure.

Flash Flood in PIMA, ARIZONA
From 17-AUG-21 16:53:00 to 17-AUG-21 17:45:00 (MST-7)
Location: (DMA)DAVIS MONTHAN A
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Broadcast Media

One inch of rain in 15 to 30 minutes created flash flooding of washes and roadways in a small portion of east Tucson. A vehicle was stranded in flowing water near 5th St. and Wilmot Rd. Flood waters also crossed roadways in Wilshire Heights near Broadway and Craycroft.

Thunderstorm Wind in PIMA, ARIZONA
From 17-AUG-21 19:21:00 to 17-AUG-21 19:33:00 (MST-7)
Location: EMERY PARK
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds several downed trees and power poles between Campbell Ave. and Palo Verde Rd. and between Drexel and Irvington Rds. About 2000 customers were without power and a section of Irvington Rd. was closed as a result. Tents at Community Food Bank were blown down causing closure of outdoor food distribution operations the following 2 days.

Flood in PIMA, ARIZONA
From 17-AUG-21 04:00:00 to 17-AUG-21 16:00:00 (MST-7)
Location: THREE PTS
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: County Official

Up to three inches of rain west and northwest of Tucson late in the evening caused flash flooding of Brawley Wash and smaller washes that flow into it.  An additional one to two inches of rainfall during the predawn hours south of Three Points flowed through the Altar Wash into the Brawley Wash causing flooding along it from northeast of Three Points through the Garcia Strip of the Tohono O'odham Nation, north to Marana from early that morning into late afternoon. Damage to area roads resulted.

Flood in PINAL, ARIZONA
From 17-AUG-21 12:47:00 to 17-AUG-21 19:00:00 (MST-7)
Location: FRIENDLY CORNERS
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flow in the Greene Wash resulting from 1 to 2 inches in southern Pinal County was enhanced by 2 to 4 inches of rain which fell during the early morning hours in northeast Pima County in the Brawley Wash and Santa Cruz River watersheds. The additional rainfall and runoff caused Greene Wash to flow 2 to 3 feet deep across Sunland Gin Rd for much of the afternoon causing damage to the road.

Thunderstorm Wind in COCHISE, ARIZONA
From 17-AUG-21 17:08:00 to 17-AUG-21 17:08:00 (MST-7)
Location: FAIRBANK
Magnitude: 56.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: County Official

Thunderstorm winds snapped a power pole along State Rte. 82 near Fairbank.

Flash Flood in PIMA, ARIZONA
From 17-AUG-21 19:58:00 to 17-AUG-21 21:00:00 (MST-7)
Location: (DMA)DAVIS MONTHAN A
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

More than one inch of rain in less than an hour caused a rapid rise in Alamo Wash where a storm had produced an inch of rain three hours earlier.  A motorist was rescued from a vehicle stuck in floodwaters on Chantilly Rd. at the Alamo Wash.

Flash Flood in COCHISE, ARIZONA
From 16-AUG-21 19:30:00 to 16-AUG-21 21:30:00 (MST-7)
Location: DOUGLAS ARPT
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: County Official

One to two inches of rain in less than an hour caused flash flooding and road damage in,  as well as both north and east of Douglas. One person was rescued from their vehicle in floodwaters on Pedregosa Rd. near State Route 80. Leslie Canyon and Glen Rds. and Washington St. were closed due to flooding. Nine metal gates of the international border wall were damaged by Silver Creek flood waters just west of the San Bernardino National Wildlife Refuge.

Hail in PINAL, ARIZONA
From 16-AUG-21 12:24:00 to 16-AUG-21 12:24:00 (MST-7)
Location: ORACLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in PINAL, ARIZONA
From 16-AUG-21 13:30:00 to 16-AUG-21 15:00:00 (MST-7)
Location: ORACLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Two to three inches in one hour caused flash flooding of washes and several road closures in Oracle.

Flash Flood in GRAHAM, ARIZONA
From 16-AUG-21 18:14:00 to 16-AUG-21 19:00:00 (MST-7)
Location: INDIAN HOT SPRINGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

More than 1 inch of rain in less than an hour in the mountains north of State Rte. 266 caused flash flooding down the mountains and mud and rocks to block a portion of that route.

Flash Flood in COCHISE, ARIZONA
From 16-AUG-21 19:36:00 to 16-AUG-21 21:00:00 (MST-7)
Location: BISBEE
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Department of Highways

Two to four inches of rain in less than two hours caused flash flooding from east of Sierra Vista to north of Bisbee to Elfrida. Floodwaters deposited several rocks on State Rte. 80 near N. Old Divide Rd. northwest of Bisbee and caused the closure of Moson and Escapule Rds and the junction of State Rtes. 80 and 90 east of Sierra Vista. Along Davis Rd. near mile post 13, six motorists were rescued from three vehicles amidst floodwaters. Courtland and Jefferson Rds, northwest of Elfrida were also closed due to flooding.

Thunderstorm Wind in PINAL, ARIZONA
From 16-AUG-21 23:50:00 to 17-AUG-21 00:30:00 (MST-7)
Location: VAIVO VO
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused minor damage to four homes in Cockleburr and four homes in Anegam.

Lightning in PIMA, ARIZONA
From 17-AUG-21 01:30:00 to 17-AUG-21 01:30:00 (MST-7)
Location: JAYNES
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a water heater at one home starting a fire, and caused damage to an adjacent house near Sweetwater and Silverbell Dr. in west Tucson.

Flash Flood in PIMA, ARIZONA
From 16-AUG-21 23:36:00 to 17-AUG-21 04:00:00 (MST-7)
Location: OLD TUSCON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

One to two inches of rain in less than an hour caused flash flooding in Picture Rocks. Manville Rd. was closed due to flooding at the Brawley Wash and Sandario Rd. was also closed.

Flash Flood in PIMA, ARIZONA
From 17-AUG-21 01:01:00 to 17-AUG-21 04:00:00 (MST-7)
Location: SAN XAVIER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Two to three inches of rain in 2 hours along and south of Highway 86 caused flash flooding south of Ryan Field Airport and around Tucson Mountain Park Estates. Sierrita Mt. Rd. was closed near Hilltop Rd. and both Sandario Rd. and Snyder Hill Rd. was closed at the Black Wash.

Flash Flood in PIMA, ARIZONA
From 17-AUG-21 01:11:00 to 17-AUG-21 04:00:00 (MST-7)
Location: TUSCON MARANA NW AIRPORT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

One to two inches of rain in two hours caused flash flooding in Marana and Avra Valley. Anway Rd. was closed south of El Camino de Tres Arroyos as well as Silverbell Rd. near the Cocio Wash. Avra Valley Rd. was closed at the Brawley Wash.