'That Is Insane': Flash Flood Submerges Cars in San Diego Flash flooding caused by heavy rain impacted San Diego, California, on January 22, submerging cars and dragging objects down the road. Footage recorded by a local shows cars partially and completely submerged, as floodwater runs down the road. “That is insane,” the recorder says as he shows the flooded area. The National Weather Service said it was the wettest January day since records began in 1850. Credit: @GabeBuckWilddd via Storyful