Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
240 AM EST Sun Nov 2 2025

Valid 12Z Sun Nov 02 2025 - 12Z Wed Nov 05 2025

...Northern Rockies...
Days 2-3...

A shortwave trough pushes in from the Pacific Northwest coast
Monday night and into Tuesday with a plume of modest 700-300mb
moisture and a band of weak 850-700mb WAA aloft. A lack of an
antecedent sub-freezing air-mass will keep snow confined to the
higher and more remote elevations of the northern Rockies. Snow
levels will vary by mountain range; from around 5000ft in the
Bitterroots and Lewis Range to 8000ft for the Sawtooths in ID, the
Absaroka, Tetons, and around Yellowstone. Days 2-3 WPC snow
probabilities are between 50-80% for >4" across most of these
ranges, while lower chances (10-30%) of >8" of snow are likely to
be confined to the higher terrain of the Cascades and Lewis Range.


The probability of significant ice across the CONUS is less than
10 percent.

Mullinax