LOS ANGELES >> After weeks of windy and dry weather, rain has fallen in parched Southern California and was expected to aid firefighters who are mopping up multiple wildfires. But potentially heavy downpours on charred hillsides could bring new troubles such as toxic ash runoff.

Los Angeles County crews spent much of the past week removing vegetation, shoring up slopes and reinforcing roads in devastated areas of the Palisades and Eaton fires, which reduced entire neighborhoods to rubble and ash after breaking out during powerful winds Jan. 7.

Most of the region was forecast to get around an inch of precipitation over several days, but “the threat is high enough to prepare for the worst-case scenario” of localized cloudbursts causing mud and debris to flow down hills, the National Weather Service said on social media.

“So the problem would be if one of those showers happens to park itself over a burn area,” weather service meteorologist Carol Smith said.

— The Associated Press