Multiple rounds of thunderstorms developed and drifted slowly across southeast Arizona from the early morning hours of August 10 through the late night/early morning hours of August 12. Individual storms produced rain of 1 to 2 inches per hour, but some locations where multiple thunderstorm events occurred received 3 to 5 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.

Lightning in PIMA, ARIZONA
From 11-AUG-21 03:00:00 to 11-AUG-21 03:00:00 (MST-7)
Location: GREEN VLY
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Lightning struck a house on N Sweet Heather Way in Green Valley causing a small attic fire, which was quickly extinguished.

Flash Flood in PIMA, ARIZONA
From 11-AUG-21 03:00:00 to 11-AUG-21 05:00:00 (MST-7)
Location: CONTINENTAL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain of 2 to 3.5 in 90 minutes caused flash flooding of washes and the closure of many roadways in Green Valley.

Flash Flood in PIMA, ARIZONA
From 10-AUG-21 05:30:00 to 10-AUG-21 06:30:00 (MST-7)
Location: ANEGAM
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rain of 1.5 in less than one hour near Kohatk resulted in minor flooding of two homes in that village.

Flash Flood in PIMA, ARIZONA
From 10-AUG-21 20:15:00 to 10-AUG-21 21:15:00 (MST-7)
Location: KAIHON KUG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Two inches of rain in less than an hour caused flash flooding across Highway 86 near Indian Route 26 northwest of Sells.

Flash Flood in PIMA, ARIZONA
From 10-AUG-21 23:30:00 to 11-AUG-21 04:00:00 (MST-7)
Location: (DMA)DAVIS MONTHAN A
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: County Official

A large area of two inches of rain occurred in three hours in east Tucson, generally east of Craycroft Rd. to the Rincon Mts. with more than 4 inches of rain from Broadway and Wilmot to Tanque Verde and Pantano Rds.  Numerous roads were flooded or damaged including Pima Rd. and Robb Wash. Several swift water rescues of motorists occurred including one vehicle washed downstream near Camino Loma Alta and Old Spanish Trail. Alamo Wash left its banks and flooded several homes between Pima and Speedway.

Flash Flood in PIMA, ARIZONA
From 10-AUG-21 07:15:00 to 10-AUG-21 09:30:00 (MST-7)
Location: MT LEMMON
Flood cause: Heavy Rain / Burn Area
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Two to four inches of rain in less than two hours over the Bighorn burn scar area in the Santa Catalina Mountains caused flash flooding of several washes and roadways.  Sutherland Wash rose over 5 feet at a gauge just east of Oro Valley and the Canada del Oro Wash also rose, especially downstream of its confluence with the Sutherland Wash. Downstream flash flooding resulted at Overton Rd where 5 people were rescued from two different vehicles which were swept downstream.

Flash Flood in PIMA, ARIZONA
From 10-AUG-21 08:30:00 to 10-AUG-21 09:30:00 (MST-7)
Location: MT LEMMON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Over one inch of rain in less than an hour caused flash flooding in Sabino Canyon Recreation area and the closure of roadways. Several hikers were stranded and needed to be rescued after floodwaters rose.

Flash Flood in COCHISE, ARIZONA
From 10-AUG-21 15:00:00 to 10-AUG-21 16:30:00 (MST-7)
Location: MC NEAL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Two inches of rain in less than an hour caused flash flooding across Davis Rd. between Tombstone and McNeal.

Flash Flood in PIMA, ARIZONA
From 10-AUG-21 23:45:00 to 11-AUG-21 00:30:00 (MST-7)
Location: CASAS ADOBES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

One inch of rain in less than 1 hour in Catalina Foothills caused flash flooding of River Rd. near Pontatoc Rd.

Heavy Rain in PIMA, ARIZONA
From 10-AUG-21 22:30:00 to 11-AUG-21 00:30:00 (MST-7)
Location: (DMA)DAVIS MONTHAN A
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Two inches of rain caused the ceiling to collapse in an apartment complex near 22nd and Craycroft. Twelve apartments sustained damage.

Flash Flood in PIMA, ARIZONA
From 11-AUG-21 05:00:00 to 11-AUG-21 07:00:00 (MST-7)
Location: TWIN BUTTES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Heavy rain of 1 to 2 in 90 minutes caused flash flooding in rural areas west of Green Valley. Mission Rd. north of Duval Mine Rd. was closed.

Flash Flood in COCHISE, ARIZONA
From 11-AUG-21 14:45:00 to 11-AUG-21 17:30:00 (MST-7)
Location: DOUBLE ABODE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

One to two inches of rain in less than an hour along Whitewater Draw caused flash flooding downstream where a vehicle abandoned in floodwaters was swept downstream at Kings Hwy. Brooks Rd. was also closed.

Flash Flood in PIMA, ARIZONA
From 12-AUG-21 01:00:00 to 12-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: Department of Highways

A broad area of 1.5 of rain, with pockets of 3 to 4, fell in less than 90 minutes and caused numerous road closures from Picture Rocks to Saguaro National Park West to southeast of Three Points. Kinney Rd. near Sonora Desert Museum was one of the major roads that was closed due to flooding.

Flash Flood in COCHISE, ARIZONA
From 10-AUG-21 13:51:00 to 10-AUG-21 16:00:00 (MST-7)
Location: PALOMINAS
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: County Official

Heavy rain of 2 to 3 inches in less than an hour caused flash flooding of several roads in the Sierra Vista area including Moson Rd. and Nevada Rd. A fence near a residence was downed by a wall of water. The water line to the home was also damaged.

Thunderstorm Wind in PIMA, ARIZONA
From 10-AUG-21 06:47:00 to 10-AUG-21 06:47:00 (MST-7)
Location: WILLOW CANYON
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Scout Camp RAWS measured a thunderstorm wind gust to 64 mph.