Rain from a powerful winter storm that swept across Southern California has begun to taper off, but another storm system was on the horizon for Christmas Day with showers and possible thunderstorms. Forecasters said Southern California could see its wettest Christmas in years and warned of flash flooding and mudslides.

A California storm on Christmas Eve caused flooding and mudslides, and prompted evacuations, power outages, and travel warnings as heavy rains hit the region.

A powerful storm brought heavy rain to parts of California on Wednesday, flooding roads and prompting evacuations in some areas. The deluge of rain is causing dangerous travel conditions on Christmas Day.

Officials in Los Angeles and surrounding counties warned that a "very dangerous" holiday storm could trigger "widespread flash flooding."

Another powerful storm system that could soak Southern California with its wettest Christmas in years rolled into the region on Thursday, potentially causing more flooding and mudslides a day after heavy rain and gusty winds were blamed for at least two deaths.

Heavy rainfall doused the Los Angeles area on Christmas Eve, forcing evacuations and leaving some residents in need of rescue as the water rose.

The storm system that brought dangerous rainfall and strong winds to Southern California will bring showers to Arizona on Christmas Day, Dec. 25.

After a harrowing and deadly Christmas Eve in California with rescues and evacuations amid widespread flooding and debris flow threats, another storm is battering the state Christmas Day, with more expected into Friday.