A powerful March storm has been lashing the West Coast with heavy rainfall, gusty winds and snowfall in the mountains –– shifting southward and posing a particular threat to communities scorched by the deadly Los Angeles wildfires from the start of the year.

California braced for the arrival of a massive storm on Wednesday, evacuating residents in areas at risk of mudslides and debris flows.

The same powerful storm that battered Southern California with heavy rain and brought blizzard conditions to the San Bernardino Mountains is putting millions on alert from coast to coast.

Incoming heavy rain from an atmospheric river-fueled storm that slammed into the West Coast early Wednesday is threatening mudslides and debris flows in Southern California and has already prompted evacuations in the Los Angeles area.

A flood watch remains in effect Thursday for parts of Southern California as the region experiences rainfall and flooding conditions.