A "bomb cyclone" riding a long atmospheric river toward the West Coast is expected to bring more than a foot of rain to parts of Northern California and 30-foot waves to the Oregon coast, but the weather won't be quite as catastrophic in and around Los Angeles, the latest forecast models show.

Over a month’s worth of rain, hurricane-force wind gusts and feet of mountain snow are coming to parts of the Pacific Northwest and Northern California.

A massive plume of moisture from the Pacific called an atmospheric river will hit the West Coast on Tuesday afternoon and last into Friday.