Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
315 PM EST Sat Nov 13 2021

Valid 00Z Sun Nov 14 2021 - 00Z Tue Nov 16 2021

...Departing low pressure systems will produce unsettled weather over New
England tonight before ending on Sunday...

...Next round of heavy rain and mountain snow arrives over the Pacific
Northwest tonight....

...An Alberta clipper will deliver another round of snow and gusty winds
across the northern tier states through the weekend...

Tonight, a low pressure center is forecast to form and intensify rather
quickly over New England while the cold front exits the East Coast.  Some
thunderstorms could form and become strong later tonight over southern New
England as the low pressure center develops. In addition, a burst of
precipitation is forecast for interior New England through tonight
following the passage of the low center. Higher elevations could see a
burst of wet snow together with gusty winds on the backside of this
system. A Slight Risk of Severe Thunderstorms was issued by the Storm
Prediction Center for southern New England tonight. Damaging wind gusts
will be the main threat with these thunderstorms, while hail and isolated
tornadoes are possible as well.

The quick round of rain/wet snow is forecast to depart New England on
Sunday as the compact storm exits into the Canadian Maritimes. Colder air
will then be ushered in across the Great Lakes, leading to the likelihood
of lake-effect snow or mixed precipitation in the lee of the Great Lakes
on Sunday.  Meanwhile, an Alberta clipper is forecast to track across the
Great Lakes on Sunday. This quick-moving storm will deliver another round
of snow and gusty winds through these areas, with rain showers farther to
the south.  By Monday morning, the Alberta clipper should be tracking near
the Canadian border of New England while another low pressure system is
forecast to form near the New England coast. The new system will later
take over as the more dominant system.

Over the Pacific Northwest, the next round of heavy rain is scheduled to
arrive on Sunday ahead of an active warm front coming from the Pacific. 
While it appears that this next round of heavy precipitation will be
confined to the northwestern portion of Washington state, the surge of
moisture will be unrelenting into Monday morning. There's a Slight Risk of
Heavy Rain leading to Flash Flooding for parts of northwestern Washington
state, as a result. 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.

Kebede/Kong


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