LOS ANGELES—Cleanup was under way after a powerful storm swept through California, setting rainfall records in the drought-stricken state but also triggering rescue efforts on a raging river and in canyon communities hit by mudslides. The National Weather Service reported remarkable rainfall, including 11 inches (28 centimeters) over 72 hours at Mount Tamalpais just north of San Francisco. By Tuesday afternoon, 8.1 inches (20 centimeters) of rain had fallen in one area of Santa Barbara County, northwest of Los Angeles. More than 4.6 inches (11.8 centimeters) fell within 24 hours in Orange County’s Silverado Canyon, south of LA, where sheriff’s deputies rescued residents after mud inundated homes in the area scarred by wildfires. No injuries were reported. Firefighters searched the surging Los Angeles River on Tuesday after discovering two submerged vehicles wedged against a bridge pillar south of downtown LA and learning that a third vehicle had been swept past …