The first round is happening Wednesday with rain along the coast and in the valleys, while snow will fall over the mountains.
A second more intense storm will move in Thursday and that will bring big-time rain and snow to a widespread area of the West.
In the short term, this could bring many hazards to the area such as flash flooding, debris flows and mudslides – especially across the burn areas.
A warm-up is happening across the East after a bit of a tease of cooler air the last few days.
Another cold front on the way on Friday will bring fall temperatures back over the weekend.