The middle’s warning got here as elements of the Pacific Northwest braced for heavier-than-usual precipitation because of an “atmospheric river,” the National Weather Service said on Twitter.
That kind of climate occasion — “a long river of moisture” that may hover over concentrated areas for a time frame — is predicted to result in very heavy rainfall or, in greater elevations, intense snowfall, stated meteorologists at the Weather Service in Seattle.
The National Oceanic and Atmospheric Administration described such occasions as “rivers in the sky.” This one extends about 3,000 miles, from the coast of British Columbia to the coast of Hawaii, stated Dustin Guy, a Weather Service meteorologist.
Though Seattle may even see about solely half an inch of rain, coastal areas and mountain areas can count on as much as three inches, stated one other Weather Service meteorologist, Matthew Cullen. In high-elevation locations, like the Cascade Mountains, elements of that are greater than 4,000 ft above sea stage, one to 2 ft of snow might fall, he stated.
A handful of atmospheric rivers have hit the space every season, and this one, thus far, is predicted to be average by way of precipitation and period, Mr. Cullen stated. Still, it’s coming to the area shortly after a very intense snowfall.