Malibu's Pacific Coast Highway, which just reopened after last month's devastating Palisades Fire, is closing again Tuesday due to concerns about potential mudslides, landslides and debris flows from a prolonged atmospheric river event.

The second peak of an ongoing atmospheric river storm arrived in Northern California Monday afternoon, prompting flood watches and a winter storm warning up in the Sierra.

Heavy Sierra snow, steady rain and gusty winds are expected Tuesday in Northern California as the result of an atmospheric river. The Tuesday morning commute will be wet and breezy across the region.