Moisture and instability from Hurricane Kay generated strong thunderstorms and heavy rain across sections of Southern California. Across the deserts, mountains and foothills, rainfall totals between 1 and 2.30 inches were observed. Strong thunderstorms generated several flash flooding events across the area. The most significant flash flooding event was near Lake Hughes in Los Angeles county where 53 people had to be extracted from their vehicles which were stuck in mud and debris.

Flash Flood in SANTA BARBARA, CALIFORNIA
From 11-SEP-22 17:56:00 to 11-SEP-22 18:30:00 (PST-8)
Location: NEW CUYAMA ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported flash flooding along Highway 166, west of New Cuyama. The flooding was the result of heavy rain from strong thunderstorms.

Flash Flood in LOS ANGELES, CALIFORNIA
From 11-SEP-22 18:20:00 to 11-SEP-22 19:20:00 (PST-8)
Location: CLAREMONT
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported flash flooding along Mount Baldy Road, about 6 miles north-northeast of Claremont.

Flash Flood in VENTURA, CALIFORNIA
From 11-SEP-22 15:42:00 to 11-SEP-22 17:00:00 (PST-8)
Location: WHEELER SPGS
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported flash flooding along State Route 33, about one mile north of the Lockwood Valley Road intersections. Several vehicles were stuck in mud and debris.

Flash Flood in LOS ANGELES, CALIFORNIA
From 11-SEP-22 13:43:00 to 11-SEP-22 15:00:00 (PST-8)
Location: LAKE HUGHES
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported flash flooding with mud/debris flows across Lake Hughes Road, about 2 miles south of the Elizabeth Lake Road intersection. Several vehicles were stuck in mud and debris.

Flash Flood in LOS ANGELES, CALIFORNIA
From 11-SEP-22 18:39:00 to 11-SEP-22 20:30:00 (PST-8)
Location: LAKE HUGHES
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported significant flash flooding and mud/debris flows across Pine Canyon Road, west-northwest of Lake Hughes. Officers reported 24 vehicles stuck in mud and debris. Over 50 people had to be air lifted out of the area due to no emergency vehicle access.

Flash Flood in LOS ANGELES, CALIFORNIA
From 11-SEP-22 19:38:00 to 11-SEP-22 21:00:00 (PST-8)
Location: THREE PT
Flood cause: Heavy Rain / Burn Area
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported flash flooding and mud/debris flows about 3 miles south-southwest of Neenach. Several vehicles, including a fire truck, were stuck in mud. Several miles of Old Ridge Route Road were closed.

Flash Flood in LOS ANGELES, CALIFORNIA
From 11-SEP-22 20:01:00 to 11-SEP-22 21:15:00 (PST-8)
Location: (SDB)SANDBERG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported severe flooding along the Northbound Interstate 5 from Pyramid Lake to Smoky Bear Lane.

Flash Flood in LOS ANGELES, CALIFORNIA
From 11-SEP-22 18:20:00 to 11-SEP-22 20:00:00 (PST-8)
Location: DESERT VIEW HIGHLAND
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

California Highway Patrol reported a significant mudslide across Highway 14 at the intersection of Avenue O.