We don’t need the storm necessarily to produce a high total amount of rainfall,” said Nina Oakley, a geohazards climatologist at the California Geological Survey who has inspected the area. “We’re concerned with short bursts of high intensity rainfall.

Rain fell across parts of Southern California, providing relief to firefighters battling wildfires but raising concerns about toxic ash runoff and mudslides. Despite progress in containing major fires,

The first significant storm of the season has brought snow and downpours to Southern California that doused wildfires and caused some ash and mud to flow across streets in the Los Angeles area.