A "bomb cyclone" swept across the northwest U.S., knocking down trees, causing widespread power outages and leaving at least one person dead.

Tens of thousands of homes in Washington state lost power Tuesday and downed wires or trees locked some highways as Northern California and the Pacific Northwest started feeling the effects of a powerful atmospheric river event,

At least one person is dead and hundreds of thousands of were without power early Wednesday as a powerful bomb cyclone hit the Pacific Northwest and northern California.

A powerful bomb cyclone has hit the Pacific Northwest, bringing hurricane-force winds, rain and snow that knocked out power to more than half a million people. The storm could result in significant flash flooding and landslides.

A powerful bomb cyclone is taking aim at the Pacific Northwest and northern California with hurricane force winds forecast to gust up to 70 mph with as much as 15 inches of rain and heavy snow in the mountains.

A major storm was sweeping across the northwest U.S., battering the region with strong winds and rain and causing widespread power outages and downed trees that killed at least one person

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

A "bomb cyclone" is forecast to bring heavy snow, high winds and life-threatening flooding to the Pacific Northwest in the next few days.

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.

Local officials across the West Coast are bracing for flash floods, power outages, and possible blizzards at high altitudes after announcing heavy rain from Nov. 19 to Nov. 22. Powerful winds also raise concerns about the increased risk of wildfires.