Favorable positioning of the monsoon high pressure system over New Mexico allowed for a surge of moisture into southern Arizona. An upper level disturbance rotating around the high was the focus for thunderstorm development across the region. Some of the storms produced damaging winds, heavy rainfall, and flooding.

Thunderstorm Wind in PIMA, ARIZONA
From 07-AUG-11 15:27:00 to 07-AUG-11 15:37:00 (MST-7)
Location: SABINO
Magnitude: 66.00 MG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained weather spotter recorded wind gusts of up to 76 mph in the Catalina Foothills area which resulted in considerable damage. Several homes received minor roof damage and broken windows and one home had its air conditioning unit blown off. Several mesquite trees were also uprooted and a brick wall was blown over near Harrison Road and Snyder Road. Some of the larger trees fell onto homes but caused only minor damage.

Lightning in PIMA, ARIZONA
From 07-AUG-11 15:30:00 to 07-AUG-11 15:30:00 (MST-7)
Location: ORO VLY
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Lightning struck a gas station in Catalina while a tanker was off-loading diesel into a 10,000 gallon tank. The strike blew open two manhole covers causing fuel vapors to ignite. The area was evacuated while the vapors quickly burned out.

Thunderstorm Wind in PIMA, ARIZONA
From 07-AUG-11 15:45:00 to 07-AUG-11 15:55:00 (MST-7)
Location: EMERY PARK
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds downed several downed power poles near the Tucson International Airport. This caused the closure of East Los Reales Road between South Sixth Avenue and South Nogales Highway and 3,200 customers to lose power.

Lightning in PIMA, ARIZONA
From 07-AUG-11 17:09:00 to 07-AUG-11 17:09:00 (MST-7)
Location: HOTASON VO
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Tohono O'odham Nation Emergency Managers reported a car being struck by lightning on Highway 86 near Indian Route 34.

Flash Flood in PIMA, ARIZONA
From 07-AUG-11 15:30:00 to 07-AUG-11 16:15:00 (MST-7)
Location: LAS GUIJAS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy rainfall fell along Highway 286 in southern Pima County with rainfall amounts up to 2.5 inches. This resulted in the flooding and closure of Highway 286 for about an hour.

Thunderstorm Wind in PIMA, ARIZONA
From 07-AUG-11 17:15:00 to 07-AUG-11 17:20:00 (MST-7)
Location: VAYA CHIN
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds caused minor damage to homes and trailers in Vaya Chin. One home's roof was blown off, allowing heavy rainfall to damage the interior of the home.

Thunderstorm Wind in PIMA, ARIZONA
From 07-AUG-11 17:45:00 to 07-AUG-11 17:55:00 (MST-7)
Location: WHY
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tohono O'odham Nation dispatch reported thunderstorm winds downed several power poles down along Highway 85 between Why and Ajo.

Flash Flood in PIMA, ARIZONA
From 07-AUG-11 18:00:00 to 07-AUG-11 18:30:00 (MST-7)
Location: LUKEVILLE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Rainfall amounts between 1.5 inches and 2.5 inches resulted flooding and the closure of  several roads at Organ Pipe National Monument. In addition, a 40 foot section of the international border fence between the United States and Mexico was destroyed.

Thunderstorm Wind in PIMA, ARIZONA
From 07-AUG-11 15:40:00 to 07-AUG-11 15:50:00 (MST-7)
Location: ORO VLY
Magnitude: 53.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm wind gusts uprooted up to two dozen trees at the Oro Valley Marketplace shopping center.