As an atmospheric river is expected to bring heavy rain and mountain snow to California, many are turning to Google to search the term "bomb cyclone." But what is that? In short, it's a rapidly intensifying storm system.

Meanwhile, Southern California this week will see dry conditions amid gusty Santa Ana winds that could raise the risk of wildfires in areas where crews are still mopping up a major blaze that destroyed 240 structures.

A strong atmospheric river storm is headed for Northern California this week, bringing heavy rain, mountain snow, high winds and the potential for flooding.