Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
432 AM EDT Fri May 03 2019

Valid 12Z Fri May 03 2019 - 12Z Mon May 06 2019


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

Weak mid-level energy embedded within northwest flow, along with a
low to mid level baroclinic zone sliding south, should support
banks of mainly light snow across portions of the northwestern
Montana Saturday night into Sunday with snow elevations around
6000ft. Moderate probabilities for four inches in Day 2.5 are over
the Glacier NP area. A more notable shortwave trough rounds the
eastern Pacific trough Sunday, pushing into northwest MT Sunday
night. The enhanced lift associated with this shortwave trough
allows some moderate probabilities for six inches around Glacier
NP on Day 3 with snow elevations 5000 to 6000ft.


...Sierra Nevada...
A closed southern stream low pushes into the central CA coast
Sunday. Pacific moisture allows rather high snow elevations of
8000 to 9000ft. Any snow will be limited to the highest Sierra
Nevada mountains on Day 3 where there are low probabilities for
six inches.


The probability of significant icing is less than 10 percent.

Jackson