Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
325 AM EST Sat Nov 17 2018

Valid 12Z Sat Nov 17 2018 - 12Z Tue Nov 20 2018


...Wyoming into Colorado...
Day 1...

A 1042mb surface high shifts southeast from eastern MT to SD today
as very positively tilted trough shifts south from the Northern
Rockies. Easterly flow ahead of this high will provide upslope
forcing which will coincide with the upper trough PVA forcing
along with being in the right entrance of an easterly jet over
southern WY into northern CO. A period of moderate to heavy snows
on eastern slopes of Rockies in this area (particularly the
Laramie Mountains) can be expected. The jet streak shifts east
through the day, reducing the lift and expected snow in CO as the
system shifts south over CO. WPC Probabilities for four inches are
moderate to locally high across southeastern WY.

Jackson