Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
432 AM EDT Wed Nov 03 2021

Valid 12Z Wed Nov 03 2021 - 12Z Sat Nov 06 2021

...Great Lakes...
Day 1...

A reinforcing shortwave trough crossing the northern Great Lakes
will continue moderate lake effect snow production over northern
Michigan with some snow off the eastern sections of Lakes Erie and
Ontario. Day 1 WPC snow probabilities are moderate for 2 or more
inches over the eastern UP and northern LP of MI and around 10
percent in far western NY and on the Tug Hill Plateau.


...Washington...
Days 2/3...

A week-long parade of shortwave troughs moves through Pacific
Northwest starting with an axis crossing tonight with a second
early Friday and a third approaching late Friday night. Snow
levels initially around 7000ft tonight will drop to 4000ft
Thursday night before dropping to 3000ft Friday night. Day 2 WPC
snow probabilities for 6 or more inches are moderate for the
higher WA/OR Cascades, then are moderately high on Day 3 for the
WA Cascades and Olympics.


For Days 1-3, the probability of significant icing is less than 10
percent.

Jackson