Rain in Southern California is expected to help firefighters responding to multiple wildfires, but potentially heavy rain on burned hillsides could cause toxic ash runoff.

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,

Rain is expected in Southern California this weekend, and although the region needs the rain, it comes with risks.