A robust atmospheric river will continue to dump overly abundant moisture across the Pacific Northwest which in turn will keep the threat for excessive rainfall and flooding elevated through Thursday.
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Warm air associated with the stream of moisture extending from the subtropical Pacific will continue to allow for very high snow levels through early Wednesday, which will exacerbate the flooding potential due to snowmelt and increased runoff.
Several inches of rainfall are forecast over the next couple of days for Washington, Oregon and northern Idaho.
Numerous flood watches, warnings and advisories are in effect along the Washington, Oregon, northern California coastline, central and eastern Washington and Oregon, and portions of northern Idaho and far northwest Montana.
The majority of the precipitation will decrease by Wednesday night into Thursday,as it shifts eastward throughout the northern Great Basin and northern Rockies, which will allow for heavy mountain snow for many of the elevated ranges.
An Alberta Clipper system continuing its trek across the Nation will also produce areas of snow from the Ohio Valley and Lower Great Lakes to the central Appalachians into Wednesday.
In general the snow is expected to be mostly scattered with light accumulations; however, portions of the Allegheny Range in western Maryland and West Virginia will have upslope flow to enhance snow across the higher terrain.
Winter Weather Advisories have been issued for the region forecast to receive at least 3 inches of snowfall.
Elsewhere, light snow showers are possible across New England and light lake effect snow is possible downwind of the Great Lakes through midweek.
Elsewhere stable and mostly dry conditions are expected with high pressure anchored in place.
Daily highs are expected to remain slightly below average along the East Coast and Southeast, while a warming trend kicks off across the central United States.
By Wednesday and Thursday 60s will be felt across the central states and even 70s in the Southern Plains.
These temperatures will be 20 to 20 degrees warmer than seasonal average extending into the Middle Missouri Valley.
Daily high temperature records will be at risk of being tied/broken from Nebraska to Wisconsin on Thursday. ■