A significant push of monsoon moisture fueled an outbreak of thunderstorms over the Mojave Desert. Many storms produced severe weather and flash flooding.

Thunderstorm Wind in SAN BERNARDINO, CALIFORNIA
From 18-AUG-14 14:14:00 to 18-AUG-14 14:39:00 (PST-8)
Location: (DAG)BARSTOW/DAGGETT
Magnitude: 52.00 MG
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The KDAG ASOS reported a gust to 60 mph. Sixteen power poles were blown down along Newberry Springs Road, forcing the road to be closed. Trees were blown down and a garage door was damaged in Newberry Springs.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 18-AUG-14 14:45:00 to 18-AUG-14 16:00:00 (PST-8)
Location: YERMO
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter measured 1.72 inches of rain, and reported that all road within about three square miles were closed due to flooding.

Flash Flood in INYO, CALIFORNIA
From 18-AUG-14 18:00:00 to 18-AUG-14 19:00:00 (PST-8)
Location: TECOPA
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

Water six to seven inches deep flowed over Highway 127.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 19-AUG-14 13:52:00 to 19-AUG-14 16:00:00 (PST-8)
Location: BANNOCK
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 95 was closed from Goffs Road to about 12 miles south of the Nevada state line due to flooding. Twelve vehicles were stranded between two washouts.

Thunderstorm Wind in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 11:29:00 to 21-AUG-14 11:29:00 (PST-8)
Location: FENNER
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew a tree onto a vehicle at a rest area on Interstate 40.

Heavy Rain in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 11:29:00 to 21-AUG-14 13:13:00 (PST-8)
Location: WHEATON SPGS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several accidents occurred along Interstate 15 near Nipton Road due to heavy rain, including one rollover and one jack knifed big rig. One person was injured (indirect).

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 12:15:00 to 21-AUG-14 13:15:00 (PST-8)
Location: ESSEX
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Essex Road was flooded near Interstate 40.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 12:15:00 to 21-AUG-14 13:00:00 (PST-8)
Location: DESERT CITY
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Rocks and debris washed over Nipton Road near Interstate 15.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 13:00:00 to 21-AUG-14 14:00:00 (PST-8)
Location: DANBY
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Rocks washed across National Trails Highway near Danby Road.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 13:00:00 to 21-AUG-14 14:00:00 (PST-8)
Location: CIMA
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Six to eight inches of water flowed over Morning Star Mine Road between mile markers 1 and 3.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 14:40:00 to 21-AUG-14 16:00:00 (PST-8)
Location: VALLEY WELLS STATION
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Cima Road was flooded near Interstate 15.

Flash Flood in SAN BERNARDINO, CALIFORNIA
From 21-AUG-14 15:30:00 to 21-AUG-14 16:30:00 (PST-8)
Location: TWENTY NINE PALMS
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Mud and debris washed over Highway 62 near Utah Trail, and the edges of the pavement were washed out.