Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
247 PM EST Tue Dec 05 2023

Valid 00Z Wed Dec 06 2023 - 00Z Fri Dec 08 2023

...Excessive rainfall and flooding potential continues across the Pacific
Northwest over the next few days...

...Moderate upslope snow forecast across the central Appalachians into
Wednesday...

...Warming trend increases across the Great Plains through midweek...

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. 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.

Campbell/Snell


Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php