Another surge of monsoon moisture led to an outbreak of thunderstorms over the Mojave Desert and southern Great Basin. A low pressure system further enhanced the storms on the 22nd.

Hail in MOHAVE, ARIZONA
From 20-AUG-12 14:20:00 to 20-AUG-12 14:30:00 (MST-7)
Location: WALAPAI
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MOHAVE, ARIZONA
From 20-AUG-12 14:23:00 to 20-AUG-12 14:33:00 (MST-7)
Location: WALAPAI
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The same storm which produced large hail and flash flooding produced wind gusts estimated at 70 mph.

Flash Flood in MOHAVE, ARIZONA
From 20-AUG-12 14:28:00 to 20-AUG-12 15:30:00 (MST-7)
Location: WALAPAI
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Ten inches of water and mud flowed down Brigade Drive.

Thunderstorm Wind in MOHAVE, ARIZONA
From 20-AUG-12 15:50:00 to 20-AUG-12 15:55:00 (MST-7)
Location: WIKIEUP
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds tipped over a pergola in Wikieup.

Flash Flood in MOHAVE, ARIZONA
From 20-AUG-12 17:18:00 to 20-AUG-12 18:30:00 (MST-7)
Location: WIKIEUP
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Mud and debris covered Highway 93 at Chicken Springs Road.

Flash Flood in MOHAVE, ARIZONA
From 20-AUG-12 20:15:00 to 20-AUG-12 21:00:00 (MST-7)
Location: (IGM)MOJAVE CO ARPT
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water and debris covered Hualapai Mountain Road between mile markers 5 and 6.

Flash Flood in MOHAVE, ARIZONA
From 21-AUG-12 16:15:00 to 21-AUG-12 18:00:00 (MST-7)
Location: PEACH SPGS
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Public

Diamond Creek Road was washed out all the way from the Peach Springs turnoff to the Colorado River.

Flash Flood in MOHAVE, ARIZONA
From 22-AUG-12 14:00:00 to 22-AUG-12 14:30:00 (MST-7)
Location: TEMPLE BAR MARINA
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Debris washed over Temple Bar Road.

Flash Flood in MOHAVE, ARIZONA
From 22-AUG-12 17:32:00 to 22-AUG-12 18:00:00 (MST-7)
Location: KINGMAN
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three inches of water along with small rocks flowed through the intersection of Hualapai Mountain Road and Eastern Street.

Flash Flood in MOHAVE, ARIZONA
From 22-AUG-12 18:06:00 to 22-AUG-12 19:00:00 (MST-7)
Location: (IGM)MOJAVE CO ARPT
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Swiftly moving water along with large rocks and debris ran across Hualapai Mountain Road between mile markers 9 and 10.

Flash Flood in MOHAVE, ARIZONA
From 20-AUG-12 15:56:00 to 20-AUG-12 18:00:00 (MST-7)
Location: MT TRUMBULL
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several roads on the way to the Bar Ten Ranch were washed out.  In addition, a wall of water, mud, boulders and trees washed out of the mouth of Fern Glen Canyon at Mile 168 of the Colorado River.