By Jill Connelly and Rich McKay WRIGHTWOOD, California, Dec 26 (Reuters) - Three days of heavy downpours that spawned flash flooding and mudslides across Southern California subsided on Friday, as residents of homes in the hard-hit mountain resort of Wrightwood began digging out mud and assessing damage.

The potential for flooding remains high because parts of the ground remain heavily saturated. Weather officials warn that rainfall will quickly turn into runoff.

A record-setting Christmas storm battering Southern California brought rushing floods that have already killed at least three people.

Another wave of rain was hitting the Los Angeles area on Friday, adding to the record-setting precipitation over Christmas.

Another powerful storm system that could cause more flooding and mudslides is rolling across Southern California.