Heavy rain​ has triggered flooding, rescues and road closures in Washington state, with Gov. Bob Ferguson declaring a statewide emergency​.

Heavy rains drenching the Pacific Northwest triggered flooding on Thursday across much of the Pacific Northwest from Oregon north through Washington state and into British Columbia, closing dozens of roads and prompting widespread evacuations.

Pacific Northwest residents are bracing for another round of heavy rain, flooding and evacuations after a powerful storm clobbered the region a day earlier. The National Weather Service says rivers across the western part of Washington were on the rise Wednesday and some areas in the Cascade

Some rivers may break records. Already, overnight into Tuesday, the Naselle River near Naselle, Washington, has gone from its normal 5 foot depth to nearly 20 feet deep, growing by 10 feet in 12 hours and coming within less than 1 foot of the historical record.

The Pacific Northwest is expected to see up to seven inches of rain this week, as the eastern United States braces for arctic cold.

NOAA is sending its famed reconnaissance aircraft into a powerful storm system that threatens widespread flooding and damaging winds for Western Washington.

For centuries, the Cascadia Subduction Zone has lurked just offshore from Northern California to British Columbia, largely invisible yet capable of unleashing one of the deadliest disasters in U.S. history.