37 million California residents on flood watch amid back-to-back storms

Santa Barbara County has the highest threat of flash flooding, mudslides and rockslides.

An already drenched California is bracing for a second storm as a multiday atmospheric river is projected to bring rainfall, wind and snowfall to the Golden state Sunday and extend through Wednesday.

The National Weather Service issued a flood watch for nearly the entire coast of California -- from Redding to San Diego and the Mexico border -- putting about 37 million residents on alert.

The first storm hit central California on Saturday, dumping less than half an inch of rain at lower elevations and around an inch at higher elevations.

The next storm starts Sunday afternoon, bringing stronger rainfall, wind and snowfall across the state.