Thomas fire-scorched hillsides will start to dissolve into mud flows if it rains at a rate of more than a half-inch an hour, according to the U.S. Geological Survey. This storm is expected to drop rain at up to three-quarters of an inch an hour for the better part of a day starting Wednesday afternoon and into Thursday morning over some of those areas, Seto said.

Source: Los Angeles Times March 20, 2018 17:26 UTC