Transcript for Torrential rain, wind slam West Coast as Southwest gets heavy snow
here tonight to those dangerous winter storms slamming both coasts tonight. 15 states on alert now from California to North Carolina. In the east, look at this, a tornado touching down in Tallahassee, Florida. Schoolchildren sheltering in place. In the west tonight, whiteout conditions in I-5 in northern California. Up to eight foot of snow in some places. And a massive mudslide damaging dozens of homes tonight. We're going to track these storms in the east and the west with the newest forecast. And there is also evacuations under way tonight. ABC's will Carr now from California. Reporter: Tonight, an atmospheric river in the west blanketing the Mon mountains in blizzard conditions and feets of snow. In the lower elevations, torrential rain. In Monterey county, California, a mudslide trapping residents and damaging as many as two dozen homes. How concerned are you about what's going to happen? Not as concerned as my wife. But we're ready if we need to go. Reporter: North in sonoma cown tin, winds sending dining tents down the street. Trees crashes into homes. Two people inside were not hurt. From a separate system in the east -- Coming down in buckets. Got a tornado warning. Reporter: Children and their teachers sheltering in school hallways as a tornado touched down in Tallahassee, flipping the plane. The airport forced to close for a time. Back in the west, that same system causing this pileup on I-40 in Arizona. And in sedona, the national Guard using a black hawk helicopter to rescue three stranded climbers. David, tonight, this area's turned into a river of mud. Crews are doing everything they can with more rain on the way. We're expecting up to ten inches into tomorrow. David? Could be a very tough night ahead. Will, thank you. Let's get right to senior meteorologist rob Marciano timing it all out for us. Hey, rob. Reporter: Hi, David. Highest impact storm certainly in California, but I don't want to undersell what's happening in the mid south, that one that dropped that tornado in Tallahassee. Heavy rain in Georgia and south Carolina. Plowable snows from Indiana all the way to North Carolina tomorrow morning. Which is right when southern California will be getting the brunt of that atmospheric river pointed right at Santa Barbara, then Los Angeles, San Diego. More damaging winds. Winds over 120 miles an hour in the mountains. Unstoppable rains and feet of mountain snow with a flood threat through Friday. Just getting slammed in California tonight. Rob, thank you.
This transcript has been automatically generated and may not be 100% accurate.