Multiple rounds of monsoonal thunderstorms occurred on August 7th through the 9th. A few severe thunderstorms produced high winds, while many others produced very heavy rain and flash flooding.

Strong Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 08-AUG-22 16:28:00 to 08-AUG-22 16:28:00 (PST-8)
Magnitude: 49.00 EG
Property damage: 0.00K
Crop damage: 1.00K
Reported by: Department of Highways

California Highway Patrol reports a downed oak tree, approximately 5 feet wide, fell across both lanes of traffic along Old Highway 80 and Deodar Tri.

Debris Flow in RIVERSIDE, CALIFORNIA
From 07-AUG-22 16:58:00 to 07-AUG-22 16:58:00 (PST-8)
Location: ANZA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

California Highway Patrol reports rocks in the eastbound lanes of Highway 74 near Pinyon Pines. Heavy rain ongoing in the area at the time.

Debris Flow in SAN BERNARDINO, CALIFORNIA
From 08-AUG-22 13:38:00 to 08-AUG-22 13:38:00 (PST-8)
Location: BIG BEAR CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

California Highway Patrol reports mud and water across both lanes of Highway 18. Radar estimates 0.25/hr-0.5/hr rain rates.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 08-AUG-22 20:00:00 to 08-AUG-22 20:00:00 (PST-8)
Location: MT LAGUNA AFS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station LGMC1 Mt Laguna reported rainfall of 1.39 inch near 6000 feet.

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

More than 200 people were stranded at the Palm Springs Aerial Tramway as heavy rain in the San Jacinto Mountains and State Park caused impassible mudflows along the exit road from the valley station. Operations of Palm Springs said mud began flowing down east of the station onto the road. The flow appeared to be mostly mud, and not debris. Rainfall of 1.99 inches was measured at the Mt San Jacinto Peak RAWS site.

Flash Flood in SAN DIEGO, CALIFORNIA
From 08-AUG-22 20:05:00 to 08-AUG-22 20:05:00 (PST-8)
Location: DOS CABEZAS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

CHP Incident report of a large rock slide and portions of S2 extending into San Diego County washed out.

Flood in SAN BERNARDINO, CALIFORNIA
From 08-AUG-22 13:58:00 to 08-AUG-22 13:58:00 (PST-8)
Location: LUCERNE VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

CHP report of van stuck in flood water on Rabbit Springs Rd in Lucerne Valley. Radar estimated around 1 inch of rain.

Heavy Rain in SAN BERNARDINO, CALIFORNIA
From 08-AUG-22 16:03:00 to 08-AUG-22 17:03:00 (PST-8)
Location: FOREST FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Yucaipa Ridge near Wilshire Peak at 9000 feet reported 0.79 inches of rainfall in 15 minutes, and 1.50 inches in 1 hour.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 08-AUG-22 20:00:00 to 08-AUG-22 21:00:00 (PST-8)
Location: MT LAGUNA AFS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station LGMC1 Mt Laguna near 6000 feet reported heavy rainfall of 1.39 inches.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 08-AUG-22 20:00:00 to 08-AUG-22 20:00:00 (PST-8)
Location: WHISPERING PINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station JULC1 Julian RAWS reported heavy rainfall of 0.85 inch.

Heavy Rain in RIVERSIDE, CALIFORNIA
From 09-AUG-22 07:53:00 to 09-AUG-22 07:53:00 (PST-8)
Location: PALM SPGS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station MSJC1 Mt San Jacinto reported heavy rainfall of 1.99 inches. Flooding was reported at the Long Valley Ranger Station, and tram operations were halted.

Thunderstorm Wind in SAN DIEGO, CALIFORNIA
From 08-AUG-22 14:45:00 to 08-AUG-22 14:45:00 (PST-8)
Location: BUCKMAN SPGS
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A 71 mph wind gust was measured from the Horse SDHGPA Mesonet Station.