Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
342 AM EDT Wed Oct 24 2018

Valid 12Z Wed Oct 24 2018 - 12Z Sat Oct 27 2018

Northern New England
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The first noteworthy winter weather event of the season across
northern New England will linger into the first half of the day 1
period through Wednesday afternoon.  The intensifying surface low
near eastern Maine Wednesday morning will continue lifting
northward across New Brunswick, Canada, with a negatively tilted
upper level trough.  A well defined deformation zone northwest of
the low along with low-mid level frontogenesis is expected to
produce a swath of moderate snow across central and northeast
Maine.  Boundary layer temperatures will be marginal, keeping
snow-to-liquid ratios modest, however dynamic cooling of the lower
troposphere and snowfall rates of up to an inch per hour Wednesday
morning should overcome the marginal ground temperatures.

The latest trends in radar and the high-res guidance over the past
24 hours suggest the axis of heaviest snow will be slightly
farther south than depicted in earlier forecasts.    The WPC
probabilities indicate a moderate potential for greater than 4
inches from Baxter State Park to Caribou.  Some lingering snow
showers will remain possible Wednesday night as the surface low
and forcing move away from the region.

The probability of significant icing (0.25 inches or more) is less
than 10 percent for all three days.

D. Hamrick