Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
326 AM EDT Wed Apr 17 2019

Valid 12Z Wed Apr 17 2019 - 12Z Sat Apr 20 2019


...Rockies...

Models are continuing to show a southern stream shortwave
momentarily closing off a mid to upper level center as it moves
across across New Mexico later this morning.  While snow levels
are expected to remain high, a period of favorable upper forcing
and upslope flow may result in some significant accumulations
across the higher peaks of the Sangre de Cristo and San Juan
Mountains in southern Colorado and northern New Mexico.

Farther to the north, mid level energy embedded within northwest
flow on the backside of a northern stream trough is expected to
produce some scattered snow showers across portions of the
northern Rockies on Wednesday.  Widespread heavy accumulations are
not expected.

A strong upper ridge shifting east across the western U.S. will
support dry conditions across much of the West on Thursday.  Then
on Friday an upper trough and its associated frontal band will
slide southeast across the Pacific Northwest and into the northern
Rockies by early Saturday, bringing some high elevation snows back
into the region.

Pereira