Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
348 PM EDT Thu Oct 08 2020

Valid 00Z Fri Oct 09 2020 - 00Z Mon Oct 12 2020


Day 1...

The probability of significant icing and/or snow is less than 10
percent.

Days 2-3...

...Pacific Northwest to the Northern Rockies...
An upper level shortwave trough and its associated cold front will
move across the Northwest on Saturday.  While snow levels are
expected to drop considerably -- from above 8000 to below 6000ft
-- heavy snow accumulations through late Saturday will likely
remain confined to the highest peaks of the Cascades. 
Post-frontal, onshore flow will continue to support showers across
the Olympics and Cascades, where snow levels are expected to hover
around 5000ft into Sunday.  Meanwhile, mountain snows are forecast
to spread west into the eastern Oregon mountains and northern
Rockies by Saturday night and then continue into Sunday. 
Significant accumulations are possible across the higher peaks of
the Blue Mountains in eastern Oregon, as well as the central Idaho
and western Wyoming ranges. 

The probability of significant icing is less than 10 percent.

Pereira