Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
437 PM EDT Tue Apr 23 2019

Valid 00Z Wed Apr 24 2019 - 00Z Sat Apr 27 2019

...Day 1...Northern Maine...

Low pressure over southeastern Ontario will shift east across
northern New England Wednesday morning. Precipitation onset ahead
of the associated occluded front occurs late tonight. Should
enough clearing occur, areas of northern Maine could see freezing
rain at the onset with some light glaze. A brief change over is
possible as the 850 mb low passes during the day Wednesday, with
cold advection allowing another risk for snow Wednesday afternoon.
Day 1 probabilities for two inches are moderate over far northern
Maine.


The probability of 4 or more inches of snow is less than 10
percent day 2.


...Day 3...Northern Rockies...

A northern stream shortwave trough reaches the Pacific Northwest
late Thursday night. Gulf moisture up the Great Plains and Pacific
moisture from the Great Basin converge to allow precip to break
out as the trough crosses the northern Rockies late Friday. Low to
moderate probabilities for four inches are in MT Rockies and
Absarokas.


The probability of significant freezing rain is less than 10
percent days 1-3.

Jackson