Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
434 AM EDT Tue Apr 29 2025

Valid 12Z Tue Apr 29 2025 - 12Z Fri May 02 2025


...Montana, Wyoming, and Colorado...
Days 1-3...

The next system of note in the West is an upper shortwave and
associated cold front that shifts south over the northern Rockies
from MT this afternoon through Wednesday. Snow levels of
6000-7000ft are expected in western MT and closer to 8000ft in
northwest WY tonight. The parent trough shifts east over the
northern Plains Wednesday night as the cold front slowly shifts
south over CO into Thursday. However, snow levels remain around
8,000-9,000ft through Thursday.

Day 1 snow probs for >6" are 30-50% in ranges around Glacier NP.
Day 1.5 snow probs for >6" are 30-70% over the Absarokas, Tetons,
and Bighorns. Day 2.5 snow probs for >6" are 40-80% for the Front
Range in CO.


The probability of at least 0.10" of freezing rain across CONUS is
less than 10%.


Jackson