Rainfall has provided relief to wildfire-stricken Southern California but posed new threats of toxic ash runoff and debris flows. Authorities are expediting cleanup efforts and implementing flood-control measures to mitigate environmental impacts.

Southern California is about to get its first significant rainfall in months, bringing desperately needed relief after dry conditions and hazardous winds fueled a series of wildfires in January. The rain could start as early as Saturday afternoon and last through Monday night with the heaviest rain coming on Sunday,

The president was greeted by Gov. Newsom in L.A. Friday afternoon for a brief trip where he announced that the state will receive full federal backing to rebuild.

President Trump is expected to visit the Los Angeles area Friday following the devastating wildfires that caused extensive damage and left at least 28 dead.