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.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 11:30:00 to 22-AUG-12 12:30:00 (PST-8)
Location: BARNWELL
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Several unpaved roads were closed due to flooding in the southeast part of the Mojave National Preserve. Sections of paved roads were covered with debris and grapefruit sized rocks.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 11:34:00 to 22-AUG-12 12:00:00 (PST-8)
Location: MOUNTAIN PASS
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rocks and debris were washed across the Bailey Road off ramp from I-15 North.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 12:00:00 to 22-AUG-12 14:00:00 (PST-8)
Location: OLD DALE
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Amboy Road was closed near Shadow Mountain Road due to flash flooding.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 13:00:00 to 22-AUG-12 13:30:00 (PST-8)
Location: (NXP)MCAF TWENTYNINE
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Water with rocks and debris ran across Highway 62 near Godwin Road.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 14:34:00 to 22-AUG-12 15:30:00 (PST-8)
Location: HOMER
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One foot of water and debris flowed across Goffs Road.  A truck was stuck in the water.

Flash Flood in INYO, CALIFORNIA
From 22-AUG-12 14:45:00 to 22-AUG-12 16:00:00 (PST-8)
Location: LONE PINE ARPT
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 136 was closed between Highways 395 and 190 due to flash flooding.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 16:00:00 to 22-AUG-12 18:00:00 (PST-8)
Location: KLINEFELTER
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 95 was closed due to water and debris flowing across the road in multiple places from mile marker 61 to just south of the Nevada state line. A big rig was stalled in one of the flooded areas.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 10:05:00 to 22-AUG-12 12:00:00 (PST-8)
Location: ELORA STATION
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

The Mid Hills and Hole in the Wall campgrounds in the Mojave National Preserve were cut off by flash flooding, stranding campers.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 22-AUG-12 10:30:00 to 22-AUG-12 11:30:00 (PST-8)
Location: JOSHUA TREE
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water flowed over Highway 62 at Sunburst Street, leaving mud and debris on the highway.

Flash Flood in INYO, CALIFORNIA
From 22-AUG-12 15:10:00 to 22-AUG-12 16:00:00 (PST-8)
Location: SCOTTYS CASTLE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Flash flooding caused significant pavement damage to Scotty's Castle Road between the castle and the Death Valley National Park boundary.  The road to Ubehebe Crater was also closed due to flooding.