Video captured by an onlooker showed a massive mudslide moving through a mountainous neighborhood in California. The mudslides and debris flows knocked down trees, plowed into homes and trapped drivers for 10 hours after several Southern California communities were hit by heavy rain, authorities said. | AP

A major mudslide in Oak Glen prompted several road closures and downed power lines Thursday afternoon. Eyewitness video shared with ABC7 shows the massive mudslide taking over a road. Authorities are asking people to stay out of the area. | ABC7

Mudflow! A mudflow, also known as a mudslide or mud avalanche, is a natural disaster where a large amount of mud, water, and debris flows rapidly down a slope or through a channel. Mudflows can be triggered by: 1. Heavy rainfall 2. Landslides 3. Earthquakes 4. Volcanic eruptions 5. Human activities (e.g., deforestation, construction) Characteristics of mudflows: 1. Fast-moving mixture of mud, water, and debris 2. Can carry large objects, such as trees and boulders 3. Destructive power, causing d