Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
255 PM EST Sun Nov 28 2021

Valid 00Z Mon Nov 29 2021 - 00Z Wed Dec 01 2021

...There is a Moderate Risk of excessive rainfall over parts of the
Pacific Northwest through Monday morning...

...Heavy lake enhanced snow downwind from the Great Lakes will start to
wind down, and light snow continues for parts of New England and The
Central Appalachians...

...Temperatures will be 15 to 30 degrees above average over parts of the
Northern Rockies and Plains...

A plume of moisture will stream into the Pacific Northwest will slowly
weaken overnight Sunday into Monday. However, the moisture will produce
heavy rain at times over parts of the Northwest through to Tuesday. 
Therefore, the WPC has issued a Marginal Risk of excessive rainfall over
parts of the Pacific Northwest through Monday morning. The associated
areas of heavy rain will create localized areas of flash flooding,
affecting areas that experience rapid runoff with heavy rain.  The rain
will continue on Tuesday over the Northwest, with less intensity.

Meanwhile, low pressure over the Great Lakes will aid in producing snow
over the Great Lakes into the Northeast/Central Appalachians.  The snow
will taper off early on Monday morning but will return overnight Monday as
a second area of low pressure moves across the region. In addition,
upper-level energy will produce a narrow area of rain over parts of the
Northern/Central Plains overnight Monday and over parts of the Middle
Mississippi Valley by Tuesday evening. Furthermore, upper-level ridging
over the western quarter of the country will allow temperatures to be 15
to 30 degrees above average over parts of the Northern Rockies and Plains.

Ziegenfelder

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