The facades of local hillsides went mostly unscathed last week, but the risk of movement will remain for at least a few weeks until the heavily saturated layers of soil dry out, officials said.
That means even a relatively minor storm forecast for Wednesday night could cause significant damage, or at least push back the drying out period.
Last week's torrential rains caused street flooding and some rock and mudslides on mountain roads, but didn't overflow local foothill-area debris basins with dirt and natural material, said Bob Spencer, a spokesman for Los Angeles County Department of Public Works. Foothill-area debris basins reached just 20% of their capacity during the storm.
"But that doesn't mean we are out of the woods," he said. "It will be several weeks before the hillsides dry out."
Meanwhile, Spencer said county officials are hoping for more mild winter weather conditions so the massive amount of loosened material stays in the hillsides and not in the local debris basins.