The first major atmospheric river system is pummeling the Pacific Northwest and Northern California, supercharged by a bomb cyclone. But officials still say it's too early to determine what the rest of the winter could bring.

A historically strong bomb cyclone, which triggered winds that killed at least two people, is working with a powerful atmospheric river to bring heavy rain, potential flooding, gusty winds and mountain snow across Northern California and the Pacific Northwest – and another storm is on the way.