A deep moisture surge across Southern California lead to widespread heavy thunderstorms across the mountains and deserts in the middle of August, leading to multiple days of flooding. Torrential downpours lead to severe flash flooding and debris flows near the Apple and El Dorado burn scars.

Heavy Rain in SAN BERNARDINO, CALIFORNIA
From 13-AUG-22 13:08:00 to 13-AUG-22 13:08:00 (PST-8)
Location: FALLSVALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station YUCC1 Yucaipa Ridge recorded 1.5 inch in one hour, with 2.28 inches of total rainfall. Location 9000 feet MSL, above Mill Creek.

Heavy Rain in RIVERSIDE, CALIFORNIA
From 13-AUG-22 13:30:00 to 13-AUG-22 13:30:00 (PST-8)
Location: ANZA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thomas Mountain recorded 1.1 inch of rain in one hour.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 13-AUG-22 14:05:00 to 13-AUG-22 14:05:00 (PST-8)
Location: WARNER SPGS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station WSGC1 recorded 0.65 inch of heavy rain in one hour 1.1 miles SW Warner Springs.

Flash Flood in SAN DIEGO, CALIFORNIA
From 12-AUG-22 18:08:00 to 12-AUG-22 18:08:00 (PST-8)
Location: BORREGO SPGS ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Caltrans report of flash flooding with water and debris flowing over the road on Highway 78 and Borrego Springs Road.

Flood in SAN DIEGO, CALIFORNIA
From 13-AUG-22 12:40:00 to 13-AUG-22 12:40:00 (PST-8)
Location: (CZZ)CAMPO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

Flooding reported along California State Route 94.

Flood in SAN DIEGO, CALIFORNIA
From 13-AUG-22 13:23:00 to 13-AUG-22 13:23:00 (PST-8)
Location: PALOMAR MTN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Roadway flooding reported on SR-79, east of Oak Grove. Report received via CHP and Caltrans Quickmap.

Heavy Rain in RIVERSIDE, CALIFORNIA
From 13-AUG-22 01:00:00 to 13-AUG-22 01:00:00 (PST-8)
Location: MECCA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Rainfall of 0.91 inch recorded at Kent Sea Farms overnight from an MCS that moved southward from Joshua Tree into the lower deserts.

Heavy Rain in SAN DIEGO, CALIFORNIA
From 13-AUG-22 12:01:00 to 13-AUG-22 12:01:00 (PST-8)
Location: DIVISION
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station MRAC1 Morena Lake recorded 0.47 inch of rain in one hour.

Flood in SAN DIEGO, CALIFORNIA
From 13-AUG-22 14:00:00 to 13-AUG-22 14:00:00 (PST-8)
Location: WARNER SPGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Widespread standing water on State Highway 79 and San Felipe Road. Radar estimated 1.0 to 2.8 inches of rain within three hours.

Thunderstorm Wind in SAN DIEGO, CALIFORNIA
From 13-AUG-22 11:50:00 to 13-AUG-22 11:50:00 (PST-8)
Location: DIVISION
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station HAUSD Hauser Mountain reported a peak wind gust of 59 knots (68 mph).

Strong Wind in SAN DIEGO COUNTY MOUNTAINS, CALIFORNIA
From 13-AUG-22 11:30:00 to 13-AUG-22 13:40:00 (PST-8)
Magnitude: 48.00 MG
Reported by: Mesonet

Strong winds occurred across the San Diego County Mountains on August 13. The following are a list of gusts recorded:
Mesonet Station MGYSD Mataguay (SDG&E): 55 mph.
Mesonet Station WARSD Warners Springs (SDG&E): 51 mph.
Mesonet Station OGVSD Oak Grove (SDG&E): 49 mph.
Mesonet Station CTMSD Corte Madera (SDG&E): 48 mph.
Mesonet Station CPOSD Campo (SDG&E): 46 mph.

Debris Flow in SAN BERNARDINO, CALIFORNIA
From 13-AUG-22 13:00:00 to 13-AUG-22 13:00:00 (PST-8)
Location: FOREST FALLS
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Mud slide under bridge at Valley of the Falls and Wood Road in Forest Falls. Mud and debris on Valley of the Falls Road. Yucaipa ridge reported 2.28 inch of rain, with 1.5 inch of rain in one hour.