news at 6:00. [captioning performed by the national captioning institute, which is responsible for its caption content and accuracy. visit ncicap.org] breaking news as we come on the air tonight. the dangerous dual weather threats rapidly intensifying. tens of millions of americans under threat from coast to coast. the monster atmospheric river slamming the west coast tonight. unleashing punishing rains, and potentially life-threatening flash flooding and landslides. part of a highway destroyed. evacuation orders in effect for communities ravaged by recent wildfires. in the central u.s., another threat. tornadoes already reported. and the new storm danger unfolding in the east. rob marciano is standing by, timing it all out. also tonight, the investigation into the deadly movie set tragedy. the powerful new images coming in. alec baldwin embracing halyna