FOUS11 KWBC 190627
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
227 AM EDT Sun Oct 19 2025

Valid 12Z Sun Oct 19 2025 - 12Z Wed Oct 22 2025

...Pacific Northwest and Northern Rockies...
Day 1...

A cold front is moving quickly through Washington this morning
with its moisture plume aimed at the Cascades. This front will
continue to move eastward at a quick pace due to the progressive
yet still amplified upper pattern. Well above normal moisture
levels (PW anomalies >90th percentile) in the warm sector will
favor high snow levels ahead of the front (>7000ft) coincident with
the heavier QPF. This will limit snow accumulation to the highest
mountain peaks before snow levels drop sharply behind the front to
4500-5000ft. To the east, snow will spread across the northern
Rockies (northern Idaho/northwest Montana and into western WY) this
morning in advance of the cold front. High snow levels initially
>8000ft will fall to around 5000-6000ft this afternoon. The quick
movement of the system will limit duration of the snow, and nearly
all the snow will clear the area by late Monday morning.

WPC probabilities for >8" of snowfall are >50% in the northern WA
Cascades above about 5000ft and will include Washington Pass
(SR-20) at nearly 5500ft elevation. To the east, WPC probabilities
for >8" of snowfall are >50% in the Bitterroots and Lewis Range
above 5000-6,000ft. Probabilities are lower over western Wyoming --
generally <40%.


The probability of significant freezing rain across CONUS is less
than 10 percent.

Fracasso

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