Subj : HVYSNOW: Probabilistic Heavy Snow And Icing Discussion
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Sun Nov 02 2025 18:33:20

FOUS11 KWBC 021833
QPFHSD

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

Valid 00Z Mon Nov 03 2025 - 00Z Thu Nov 06 2025

....Washington Cascades & Northern Rockies...
Days 1-2...

Active weather pattern picks up once again across the West as 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 substantial
antecedent sub-freezing air- mass will keep heavy snow confined to
the higher and more remote elevations of the WA Cascades and
northern Rockies.However, accumulating snow is possible at some
passes above 4500ft. Snow levels will vary by mountain range; from
around 4000-5000ft in the WA Cascades, Bitterroots and Lewis Range
of NW MT to 8000ft for the Sawtooths in ID, the Absaroka, Tetons,
and around Yellowstone. QPF and snowfall amounts have increased
somewhat with today's forecast update across the Cascades. Days 1-2
WPC snow probabilities are now between 50-80% for >8" across the
WA Cascades above 5000ft, while lower chances (30-60%) of >8" of
snow are likely to be confined to the higher terrain of the NW MT
Ranges. The next system approaches the West Coast by Day 3, but is
associated with a much deeper eastern Pacific trough and in
response much higher snow levels along the West Coast, limiting
widespread impactful heavy snow.


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

Snell




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