Rain and debris washed out roadways and left vehicles stranded in standing water. Parts of Los Angeles County had almost 7 inches of rain; Beverly Hills had almost 5 inches by early Monday. Downtown Los Angeles saw its wettest August day ever on Sunday when 2.48 inches fell.

More than 100 miles to the east in Riverside County, a foot of rain fell on Mount San Jacinto. The nearby Coachella Valley was hit hard, and Palm Springs police at one point Sunday said 911 lines were down so residents had to text 911 or reach out to the nearest police or fire station. Crews in Rancho Mirage pumped floodwaters out of the Eisenhower Medical Center. Officials in Palm Desert urged residents to stay home or proceed with caution while workers cleaned up downed trees and mitigated flooding.