Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
351 AM EDT Thu Oct 25 2018

Valid 12Z Thu Oct 25 2018 - 12Z Sun Oct 28 2018

New England
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Miller Type A cyclogenesis along the East Coast Friday night and
into Saturday will result in a nor'easter for the northern
Mid-Atlantic region and extending northward into New England. 
Isentropic lift north of the surface low within the moist conveyor
belt is expected to produce widespread light to moderate
stratiform precipitation within the developing comma head region. 
The northern edge of the precipitation shield will likely involve
some winter weather across parts of Upstate New York and extending
eastward across interior New England by Saturday morning.

A cold surface high is expected to reside across southern Quebec
and Maine Friday night, and this will likely supply enough cold
and dry air for a brief period of accumulating snow from the
Catskills and Adirondacks to central Maine, with amounts on the
order of 1 to 3 inches expected during the first six hours of
precipitation.  By Saturday afternoon and evening, warm air
advection centered around 850mb is expected to lead to some sleet
and freezing rain for central and northern New England, and mainly
rain for the coastal plain.  WPC probabilities indicate a slight
risk for significant ice accumulations of a quarter inch across
parts of northern New Hampshire and northwestern Maine, with this
mainly for elevated interior valley locations.

D. Hamrick