This is NBC Nightly News with Tom Yamas.

And good evening. I'm Sam Brock in for Tom tonight.

The situation is both dangerous and still unfolding for 32 million people under flood alerts in California,

with a new round of rain arriving.

Take a look at this. The hard hit mountain community of Wrightwood slammed with torrential rain overwhelming

the town, mud reaching the roofs of some homes. People there still under orders to shelter in place.

Near Los Angeles, water surging through this small parking lot gushing out like a waterfall. And across

the region, harrowing rooftop rescues after heavy rain sent debris crashing through neighborhoods.

Now attention turns to the northeast, where a major post-holiday storm is also taking aim

with heavy snow projected. But we begin tonight on the West Coast with Dana Griffin.

Tonight, after life-saving rescues as a deadly storm battered the West Coast, there's still a threat of mudslides and more flash flooding.

The area hardest hit, this mountain community in Wrightwood.

Dina Talling is stuck there without power.

How has this impacted your Christmas?

Oh gosh.

So I just became a grandmother for the first time three and a half

weeks ago. Yeah, and I'm stuck up here. I'm stuck up here alone. In San Bernardino County,

where raging water flooded entire communities, many who didn't evacuate were forced to shelter in

place or be rescued.

When you see those images, it doesn't look real.

It really doesn't.

Firefighter, Christopher Prater, describes the harrowing ordeal.

...