Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
411 PM EST Thu Nov 14 2019

Valid 00Z Fri Nov 15 2019 - 00Z Mon Nov 18 2019


...Pacific Northwest...

Day 1 into Day 2...
A ridge up the West Coast breaks down during the day on Friday as
a trough ejects east off a Gulf of Alaska low. The progressive
trough is accompanied by modest Pacific moisture and heights fall
enough to reduce the snow level to around 5000ft. Localized heavy
snow is expected on preferred western slopes of the WA Cascades as
well as northern ID/MT Rockies by late Friday or early Saturday.

A deeper plume of Pacific moisture arrives into WA Saturday.
Elevated moisture looks to raise snow levels over 10000ft.

For Days 1-3, the probability of significant icing (0.25-inch) is
less than 10 percent.

Bann