Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
429 AM EDT Tue Apr 16 2024

Valid 12Z Tue Apr 16 2024 - 12Z Fri Apr 19 2024


...Colorado Rockies...
Day 1...

Upper low over eastern CO this morning will shift northeast to
eastern Nebraska today. Heavy snow continues over the northern CO
Rockies this morning with snow levels around 8000ft as lagging
vorticity rotates through, aided by NNWly winds into the terrain.
Expect a few more inches in the highest elevations. Snow will
diminish this afternoon as the upper low pulls away and heights
rise in its wake.



...Northern Rockies...
Days 1-2...

Trough over southern British Columbia digs through Montana this
afternoon through Wednesday. Post cold-frontal snow aided by
northerly upslope flow beneath the left exit of a 120kt Wly jet.
High pressure nosing down the Canadian Rockies tonight will help
increase snowfall and rates up around 1"/hr over favored areas,
like in the Lewis Range/Glacier NP but especially into NW Wyoming
(Yellowstone, Absarokas) and southern MT and the Bighorns. WPC snow
probabilities are currently offline, but several inches can be
expected through Wednesday above snow levels that drop tonight to
around 3000ft. Mainly light snow persists Wednesday night through
Thursday night.


The probability of significant icing is less than 10 percent.


Jackson