Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
426 AM EDT Thu Apr 01 2021

Valid 12Z Thu Apr 01 2021 - 12Z Sun Apr 04 2021


...Central Appalachians to Northeast...
Day 1...
An amplifying upper trough moves east over the eastern Great Lakes
and central Appalachians today, closing into an upper low over
Lake Ontario by this evening, elongating north to south from
Quebec to the Mid-Atlantic overnight. Surface low pressure
currently centered over southern New England and will track
north-northeast across eastern Maine through midday. Northwest of
the low track will continue to be a thump of moderate snow, moving
from far northeast PA and upstate NY and up well interior New
England through midday. Under the upper low increasing lapse rates
and some instability will allow scattered snow showers from
upslope areas of WV and up the Appalachians into New England
through this evening.

Day 1 snow probabilities are moderate for 4 or more inches from
the northern Adirondacks the northern Greens, and along the
NH/Maine and Quebec borders. A wintry mix is expected across
portions of far northern Maine.  While widespread significant
icing is not expected, Day 1 ice probabilities are 20 to 30
percent in upper northeast Maine.

Jackson