Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
400 AM EST Sat Mar 07 2020

Valid 12Z Sat Mar 07 2020 - 12Z Tue Mar 10 2020


Days 1-3...

...Western U.S....
A front associated with a weakening upper level trough will move
south and east, bringing light to moderate mountain snows to
portions of the northern Rockies, Intermountain West, southern
Cascades and northern Sierra on Saturday.  WPC PWPF indicates some
potential for locally heavy amounts of 8-inches or more from the
Shasta-Siskiyou region into the northern Sierra on Saturday. 

Sunday is expected to relatively quiet, with mainly light snows
expected across portions of the Sierra and the northern to central
Rockies.  Some heavier snows may return to portions of the
northern Rockies on Monday, particularly the western Wyoming
ranges.  WPC PWPF shows probabilities for amounts of 8-inches or
more increasing on Monday across the higher elevations as a
low-to-mid level boundary associated with an approaching upper
trough settles into the region.

For Days 1-3, the probability of significant icing (0.25-inch or
greater) is less than 10 percent.

Pereira