Mandatory evacuations are being ordered for hundreds of homes in southern California as the region braces for more rain and possible mudslides.

The National Weather Service says the storm could dump up to 1.5 inches of rain on San Gabriel Mountain. They issued a flood watch for Tuesday afternoon through the evening for areas below the steep slopes that were damaged by the massive wildfire last summer.

The showers could put more pressure on the debris basins designed to keep mud and boulders away from homes near the burn areas.

Authorities have ordered evacuations for more than 500 homes in mudslide-prone foothill neighborhoods, telling residents to be out of their homes by Tuesday morning.

Forty-three homes were damaged over the weekend when mud roared through La Canada Flintridge during a heavy downpour.