Much of Southern California is expected to get at least an inch of rain from Monday night to Tuesday morning. That’s more than enough to cause debris flows, according to Chief Sam DiGiovanna of the Verdugo Fire Academy. The Pacific Palisades, Malibu and Altadena neighborhoods, which already experienced so much destruction from the wildfires this year, are especially vulnerable due to a lack of vegetation or steep slopes.

Why are burn scar areas more vulnerable to mudslides?

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We have what's called hydrophobic planning: When the vegetation is completely stripped from the hillsides, the water runs right off the hillside area, collects a lot of the water in the mud, and it can lead to mudflow and erosion problems. Withou

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