When hills are healthy, vegetation can anchor the soil in place. But when that is burned off, hillsides become vulnerable to erosion, and slopes can come crashing down.

Another round of wet and windy weather was set to run through the Bay Area beginning Tuesday evening, with the storm triggering multiple warnings and advisories.

In some areas, hazards have surged. Buildings in the highest severity zones will be subject to the strictest fire-resiliency rules.

Another atmospheric river storm packing heavy rain and powerful winds is taking aim at the Bay Area. Here’s what to know.