Rain in Southern California Will Aid Firefighters but Create a Risk of Toxic Ash Runoff | KQED
Briefly

Heavy rainfall is forecasted for areas in Los Angeles, particularly over recent burn zones, raising concerns about the potential for debris flows. Officials have issued flood watches and are engaging in proactive cleanup efforts, including an executive order from Mayor Karen Bass to expedite debris removal and install flood-control measures. The ash from burn areas poses a serious health risk to residents due to its toxic composition. These concerns are heightened in light of past tragedies, including the deadly Montecito mudslides in 2018.
So the problem would be if one of those showers happens to park itself over a burn area; that could create debris flows.
Officials cautioned that ash in recent burn zones was a toxic mix of incinerated cars, electronics, batteries, building materials, paints, furniture and other household items.
Read at Kqed
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