Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
423 AM EDT Sat May 04 2019

Valid 12Z Sat May 04 2019 - 12Z Tue May 07 2019

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

A mid-level shortwave trough will enhance lift as it passes over a
baroclinic zone across MT Sunday into Sunday night. The associated
front is pushing south over MT now. Even with the cold air from
Canada, snow elevations are generally above the plains and
accumulations are limited to higher mountains. There is a
potential for heavy snow over the Glacier National Park region,
with both Days 1 and 2 WPC probabilities moderately high for four
inches over the Lewis Range and the Big Snowy Mountains. There are
low probabilities over the highest crest of the Lewis Mountains
for 12 inches in 48 hours.


The probability of significant icing is less than 10 percent.

Jackson