Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
259 PM EST Thu Jan 06 2022

Valid 00Z Fri Jan 07 2022 - 00Z Sun Jan 09 2022

...There is a Slight Risk of excessive rainfall over parts of the Pacific
Northwest through Friday morning...
...Heavy Snow for the Central Appalachians and the Northeast Coast on
Monday; Heavy Snow for the Cascades/Northern Rockies...
...Heavy lake effect snow for the area around the east coast of Lake
Michigan...
...Temperatures will be 20 to 30 degrees below average over the
Northern/Central Plains and Upper /Middle Mississippi Valley...

On Thursday evening, a wave of low pressure over the Southeast will move
northeastward off the Mid-Atlantic Coast by Friday morning.  The system
will produce heavy snow from parts of the Ohio/Tennessee Valleys into the
Central Appalachians overnight Thursday into early Friday morning.  The
low moves northeastward just off the Northeast Coast on Friday before
moving into the Canadian Maritimes by Friday evening.  The storm will
produce heavy snow along the New England Coast on Friday morning into late
afternoon.  The combination of snow and ice may cause hazardous road
conditions through Friday morning in this region.

Furthermore, upper-level energy and cold air moving over Lake Michigan
will produce heavy lake effect snow along most of Lake Michigan's east
coast, ending overnight Friday.  The snow will result in reduced
visibility and hazardous driving conditions.

Meanwhile, a plume of moisture off the Pacific and upper-level energy will
produce rain and higher elevation snow over the Pacific Northwest and snow
into the Northern Rockies.  The rain will be heavy at times.  Therefore,
the WPC has issued a Slight Risk of excessive rainfall over parts of the
Pacific Northwest through Friday morning.  The associated heavy rain will
create mainly localized areas of flash flooding, with urban areas, roads,
and small streams the most vulnerable through Friday morning.  The
excessive rainfall threat ends on Friday over the Northwest.  However,
heavy snow will also develop over the highest elevations of the Cascades
and the Northern Rockies ending by Saturday morning, with much lighter
snow falling after then.

Moreover, cold high pressure over the Northern Plains will move
southeastward to the Mid-Atlantic by Saturday.  The associated clear skies
and calm winds will allow the temperatures to become 20 to 30 degrees
below average over the Northern/Central Plains and Upper /Middle
Mississippi Valley.

Ziegenfelder


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