Forecasters released a breakdown Tuesday of where and when heavy rainfall this week is expected to hit areas of Southern California left burn-scarred by recent wildfires, raising the risk of potentially dangerous debris flows in those parts of the region.

Another major storm system threatening the West Coast with rain, mudslides and flooding is triggering new evacuation warnings in areas of California impacted by last month's wildfires. CBS News national weather correspondent Rob Marciano has more.

For the second time this year, Southern Californians are evacuating their homes as heavy rain threatens new destruction in areas still recovering from last month’s devastating wildfires.