With millions of people preparing to travel for the Thanksgiving holiday, two strong storm systems, including a bomb cyclone on the West Coast, are expected to bring high winds, heavy rain and snowfall to a large swath of the United States this week.

A powerful storm is bearing down on the West Coast and bringing with it a scary-sounding weather term - bomb cyclone. Bomb cyclone is a term used by weather enthusiasts to describe a process that meteorologists usually call bombogenesis.

A powerful winter storm brewing near the Pacific Northwest known as a bomb cyclone is dragging an atmospheric river.