Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
316 PM EST Sat Nov 17 2018

Valid 00Z Sun Nov 18 2018 - 00Z Wed Nov 21 2018


Days 1-3...

...Great Lakes and Northeast...

The period looks to be quiet with respect to heavy snowfall
(amounts greater than 4-inches) and significant  icing (0.25-inch
or more) -- with the 24-hour probabilities of exceedance remaining
below 10 percent for much of the CONUS through 00 UTC Wednesday. 
There are some spotty areas where probabilities do increase to 10
percent or more (Slight Risk) for 4-inches in the lee of Lake
Superior,  where some light synoptic snows, followed by lake
effect snow showers are expected to develop in association with
the passage of a shortwave trough moving across the region on
Monday.  As the system moves further east, backing flow ahead of
the system will support increasing moisture advection and the
potential for light precipitation across the Northeast, with snows
across the mountains of northern New England possibly totaling
4-inches or more.

The probability of significant (0.25-inch or more) is less than 10
percent.

Pereira