Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
214 PM EDT Mon Apr 15 2024

Valid 00Z Tue Apr 16 2024 - 00Z Fri Apr 19 2024


...Colorado Mountains...
Day 1...

Upper low entering western CO this evening will continue eastward
across the state tonight and into western KS by Tuesday morning,
with heavy snow over the high Rockies where WPC probabilities for
at least 8" are high (>70%) above 9000ft or so. Wrap-around/upslope
snow will continue through the early morning hours over the Park
Range and Medicine Bow as lagging vorticity rotates through, aided
by NNW winds into the terrain. Snow will diminish by Tuesday
afternoon/early evening as the upper low pulls away and heights
rise in its wake.


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

Digging trough moving into British Columbia and the northern
Rockies tomorrow night will bring a cold front through the region,
with post-frontal snow aided by upslope flow beneath a 120kt jet.
High pressure nosing south out of Canada will help increase
snowfall over favored areas, like in the Lewis Range/Glacier NP but
especially into NW Wyoming (Yellowstone, Absarokas) and southern
MT and into the Bighorns. WPC probabilities for at least 8 inches
of snow are high (>70%) above about 7000-8000ft. Probabilities for
at least 18 inches of snow are >50% above 8500-9000ft in
WY/southern central MT. Snow will decrease from northwest to
southeast starting early Thursday but will still linger through the
end of this forecast period.


The probability of significant icing is less than 10 percent.


Fracasso