Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
140 AM EDT Wed Oct 29 2025

Valid 12Z Wed Oct 29 2025 - 12Z Sat Nov 01 2025


...Washington Cascades...
Day 3...

An impressive shortwave will again lift towards British Columbia
late Friday and Friday night, channeling moisture within confluent
SW mid-level flow into the Pacific Northwest. Both IVT and PW
anomalies from NAEFS are progged to exceed the 97th percentile
within the CFSR climatology, suggesting that precipitation may
become heavy very late on D3. However, the accompanying WAA driving
this moisture plume northeastward will surge snow levels to
8000-9000 ft, and any cold advection associated with a surface
front will be delayed until beyond this forecast period. Still,
some high elevation snow is likely in the northern WA Cascades,
reflected by WPC probabilities reaching up to 50% for 6+ inches,
but impacts should remain above pass level into Saturday.

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

Weiss