Pacific Northwest faces renewed flood threat due to atmospheric river

Relentless rainfall and snowfall lb West Coast; California, Pacific Northwest brace for adjacent storm

Multiple storms volition erstwhile again slam parts of the West Coast aft weeks of rain, flooding and snow. Wet upwind is expected done the archetypal fractional of Monday from the Bay Area northward, with the imaginable for immoderate lingering coastal flooding. A Flood Watch remains successful effect for parts of Northern California done Monday. The menace shifts to the Pacific Northwest Tuesday, wherever the adjacent tempest volition driblet 1-2 inches of rainfall connected the beleaguered coasts of Washington and Oregon. Winter Storm Watches person been issued for the Cascades wherever up to 4 feet of snowfall could autumn done Wednesday.

WASHINGTON - A tempest system, paired with an atmospheric river, volition determination done the Pacific Northwest connected Monday, causing much rainfall successful an country that has been inundated with precipitation successful caller weeks.

An atmospheric stream is forecast to interaction the country present done Tuesday. Widespread rainfall amounts betwixt 1 and 2 inches are likely, with 3 to 5 inches of rainfall imaginable successful areas specified arsenic the Olympics and Cascade foothills.

WHAT IS AN ATMOSPHERIC RIVER?

What causes an atmospheric stream is simply a constrictive corridor of concentrated h2o vapor — usually from tropical origins — that is being carried by the pitchy stream. They are Earth's largest rivers — but successful the sky.

This graphic shows however overmuch rainfall is expected to autumn successful Washington done Monday.

(FOX Weather / FOX Weather)

Several months of accordant precipitation has near Washington successful request of a adust period, and Seattle is presently fractional an inch supra its year-to-date average, leaving galore determination rivers adjacent flood stage.

In the past fewer weeks, 1 idiosyncratic has died owed to dangerous flooding successful Northern California.

WATCH: LEVEE FAILURE PROMPTS OVERNIGHT EVACUATIONS, IMPACTS HUNDREDS OF HOMES IN WASHINGTON

In Washington, 2 levees failed, resulting successful a flood that near full neighborhoods swamped, affecting implicit 220 homes successful the metropolis of Pacific. A antheral besides drowned aft helium drove his car onto a flooded road, conscionable southbound of Snohomish, Washington.

This graphic shows which areas of Washington could spot stream flooding successful the coming days.

(FOX Weather / FOX Weather)

As lukewarm aerial surges into the region, snow levels are expected to ascent from 2,500 to implicit 7,000 feet by Sunday evening, creating hazardous conditions for upland walk travel, according to the FOX Forecast Center.

HOW TO WATCH FOX WEATHER

The Skykomish, Snohomish and Skagit rivers are already adjacent bankfull, which means much rainfall volition apt trigger flooding by aboriginal adjacent week.

Check backmost for updates connected this processing story.