Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
314 PM EDT Tue Apr 30 2019

Valid 00Z Wed May 01 2019 - 00Z Sat May 04 2019



...Northern and Central Rockies and High Plains...

Overall, models are in good agreement with a mid-level shortwave
trough and associated low level low moving across Wyoming Tuesday
evening.  Strong northeasterly flow on the backside of the low
along with an upper jet couplet will support locally heavy amounts
for portions of western Wyoming - notably the Big Horn, Wind River
and Beartooth mountains, where WPC probabilities indicate a
Moderate Risk or greater for snow amounts of 8-inches or more
during the Day 1 Period (ending 00Z Thursday).  Lighter amounts
are forecast farther east into the into the high plains of eastern
Wyoming and western South Dakota, as well as the Black Hills -
with a Slight Risk for 8-inches or more encompassing much of the
region.  Meanwhile, a trailing frontal boundary is expected to
support locally heavy amounts as it moves from the Uinta and
Wasatch into the western Colorado ranges Tuesday evening and
overnight. 

Pereira