Areas of California ravaged in this month's wildfires are now facing potential mudslides and flash floods.  Rain across the state has prompted flash flood warnings and evacuation orders in areas affected by the Camp, Woolsey and other wildfires.  Burned ground  is less permeable , so water flows more freely off the surface, increasing the chances of flooding, which in turn can spread dangerous debris.  At least 88 people died in the Northern California Camp Fire, and more than 100 more remained missing as of Thursday afternoon.  In January, more than 20 people  died in mudslides  in areas of Southern California burnt by the Thomas fire the previous month.