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

A low-pressure system headed for Northern California and Oregon is likely to bring extreme rain and strong winds.

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

Bomb cyclone is a term used by weather enthusiasts to describe a process that meteorologists usually call bombogenesis. It's the rapid intensification of a cyclone in a short period of time, and it can happen during powerful storms such as the one no rthern California and the Pacific Northwest are preparing for this week.

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 huge storm is predicted to hit Washington, Oregon, and California this week linked to atmospheric river weather systems.

As the strongest atmospheric river that California and the Pacific Northwest has seen this season bears down on the region, the Weather Prediction Center issued excessive rainfall risks beginning Tuesday and lasting through Friday.