Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
415 PM EDT Wed Apr 26 2023

Valid 00Z Thu Apr 27 2023 - 00Z Sun Apr 30 2023

...Rocky Mountains...
Days 1/2...

A shortwave trough currently moving east over central BC will
shift southeast down the Canadian Rockies tonight and then south
down the extent of the U.S. Rockies through Friday. Height falls
from the trough along with colder conditions behind the associated
cold front associated will allow a change of rain to snow for
higher elevations. Northerly to northeasterly flow post-FROPA on
Thursday will favor the Belt and Absaroka Mtns in Montana and the
Bighorns in WY where there are moderately high probabilities for
>4" on Day 1. Then decent coverage of snow over terrain in CO
Thursday night into Friday with moderately high Day 2 probs for
>4" for the Bighorns again, the Black Hills, Laramie Range, and
most CO Rocky ranges though there will be less emphasis on the
eastern side of the Continental Divide than the case last night in
CO.


The probability of significant icing greater than 0.25" is less
than 10 percent.


Jackson