An upper-level trough combined with strong instability (SB CAPE of 2000+ J/KG) and high moisture content (PWAT of 1.7+ inches) to result in the development of strong to severe thunderstorms across portions of Riverside and Imperial Counties during the afternoon and early evening hours. A complex of thunderstorms originating from southwest Arizona moved westward through Riverside while intensifying in the process. Another complex of storms then developed near the international border and affected Imperial County.

Flash Flood in RIVERSIDE, CALIFORNIA
From 08-AUG-22 15:34:00 to 08-AUG-22 16:34:00 (PST-8)
Location: CHIRIACO SUMMIT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

South Boundary Road of Joshua Tree National Park was closed due to flooding. All visitors were evacuated from the southern portion the park. No damages or injuries were reported.

Flash Flood in RIVERSIDE, CALIFORNIA
From 08-AUG-22 14:08:00 to 08-AUG-22 16:08:00 (PST-8)
Location: CHIRIACO SUMMIT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

Pinto Basin Road in Joshua Tree National Park was closed due to washes running over road. The water was estimated to be running 1 foot in depth over the road. No damages or injuries were reported.

Strong Wind in IMPERIAL VALLEY, CALIFORNIA
From 08-AUG-22 17:27:00 to 08-AUG-22 17:27:00 (PST-8)
Magnitude: 49.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Department of Highways

Power line was down near the intersection of West Aten Road and Austin Road in Imperial. The power pole reportedly caught fire. Timing was estimated using a reported wind gust measurement of 56 mph at the El Centro Naval Air Facility. No injuries were reported.

Dust Storm in IMPERIAL COUNTY WEST, CALIFORNIA
From 08-AUG-22 17:30:00 to 08-AUG-22 17:50:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Near zero visibility reported by Border Patrol in blowing dust from thunderstorm outflow near the junction of Highway 78 and Highway 86 south of Salton City. No accidents or injuries were reported.

Dust Storm in IMPERIAL VALLEY, CALIFORNIA
From 08-AUG-22 17:37:00 to 08-AUG-22 17:57:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Social media video showed visibility was down to about 1/4 mile in blowing dust from thunderstorm outflow at the Imperial County Fire station at the Airport. No accidents or injuries were reported.

Dust Storm in IMPERIAL VALLEY, CALIFORNIA
From 08-AUG-22 17:40:00 to 08-AUG-22 18:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Visibility down to 1/4 mile was reported in blowing dust from thunderstorm outflow near the intersection of Acapulco Road with Cross Road in Imperial. No accidents or injuries were reported.

Flash Flood in IMPERIAL, CALIFORNIA
From 08-AUG-22 19:30:00 to 08-AUG-22 22:00:00 (PST-8)
Location: CACTUS
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Department of Highways

Ogilby Rd was closed due to flood debris and a road washout. Timing estimated from radar. No injuries were reported.

Flash Flood in RIVERSIDE, CALIFORNIA
From 08-AUG-22 14:42:00 to 08-AUG-22 15:42:00 (PST-8)
Location: CHIRIACO SUMMIT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Box Canyon Road near I-10 was closed due to flooding. Vehicle with two occupants was stranded in the flood water. No damages or injuries were reported.