The NWS says a series of weather systems will bring an estimated 2 to 6 inches of rain to western Washington through Wednesday. Officials say urban and small stream flooding is possible for areas with poor drainage, and saturated soils are at increased risk for landslides and debris flows.

A powerful atmospheric river has triggered historic flooding across western Washington, forcing evacuations as the Skagit River nears record-shattering levels and communities brace for widespread damage.

SKAGIT COUNTY — The sun set Thursday over the soggy and worried people of Western Washington while the fast-running Skagit River, full of sediment and debris, swelled.

A century-old Skagit River dike is holding as 75,000 residents remain under evacuation orders. Officials warn flood risks will continue into Saturday morning.

Portions of western Washington state have experienced a month’s worth of rain within the past few days, causing historic flooding, damaging mudslides and more than 100,00 people facing potential evacuations.

The Skagit River is predicted to crest at more than 47 feet near the town of Concrete, north of Seattle, 15 inches above the threshold for a major flooding event.

An arctic air blast is plunging south from Canada, spreading into the northern United States. Meanwhile, residents of the Pacific Northwest are bracing for possible mudslides and levee failures as floodwaters slowly recede.