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.

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

Late-winter storms bringing heavy rain, evacuation order and warnings, flood warnings and road closures is in the forecast Wednesday for Los Angeles and Orange counties and is expected to douse the region for the next three days.

Southern California welcomed a surge of moisture that forecasters say could be the first in a series of early March storms, including a potential atmospheric river.

A colossal storm is threatening to bring severe weather to much of California this week and could impact travel over the Grapevine. Here's what to know.

The Southern California area has one more day of sunny conditions before a set of storms will bring moderate to heavy rain and snow over the next couple of days, forecasters say. The National Weather Service said a slight chance of rain will develop overnight Monday as the first storm continues to make its way into the region.