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.

Parts of Northern California are under a flood watch through Tuesday as an atmospheric river brings heavy rains to a region that’s also anticipating plenty of snow.

An atmospheric river is pounding Northern California with heavy rain and the threat of flooding before heading to Southern California.