Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
300 AM EST Sun Nov 14 2021

Valid 12Z Sun Nov 14 2021 - 12Z Tue Nov 16 2021

...Heavy rain and mountain snow resumes over the Pacific Northwest....

...An Alberta clipper will deliver rain/snow and gusty winds across the
Great Lakes today and then New England on Monday...

...Another Alberta clipper will bring light rain/snow for the northern
Plains to upper Midwest into Monday morning...

...A much stronger storm will spread mountain snows and high winds across
the northern Rockies to northern High Plains Monday night to Tuesday...

A compact low pressure center that brought a quick dose of rain, high
elevation snow, and gusty winds through New England last night is quickly
moving off into the Canadian Maritimes early this morning.  Clearing skies
will quickly move into the Northeast today as mixed rain and snow from an
Alberta clipper moving across the upper Midwest this morning spreads into
the Great Lakes.  While the precipitation associated with this system will
mainly be light, the coverage of mixed rain and snow will be widespread as
it tracks across the Great Lakes today and then across New England on
Monday.  The western slopes of the central Appalachians will likely see a
few inches of snow while the lee side of the lower Great Lakes should see
locally higher amounts on Monday when the system moves across New England
and drags colder air across the warm lake waters.  By Tuesday morning, the
system should have moved far away into the Canadian Maritimes that the
lake-effect rain/snow will be tapering off.

Over the Pacific Northwest, the wave of heavy rain has arrived well ahead
of an active warm front.  While it appears that this round of heavy
precipitation will be confined to the northwestern portion of Washington
state, the unrelenting surge of moisture will lead to a slight risk of
flash flooding today especially for the higher elevations of northwestern
Washington state.  A much stronger low pressure system will then form. 
The higher elevations of the northern Cascades will likely see heavy snow
measured in feet during the next few days.  This system will then move
into the Northern Rockies Monday night as it spreads rain and high
elevation snow into the region.

The entire western U.S. will remain milder than normal through the
weekend.  Much milder than normal conditions are expected over the
northern High Plains on Monday with developing downslope flow as another
Alberta clipper is forecast to form.

Kong


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