FOUS11 KWBC 280647
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
247 AM EDT Sat Mar 28 2026

Valid 12Z Sat Mar 28 2026 - 12Z Tue Mar 31 2026

...Pacific Northwest/Northern Rockies... Days 2-3...

A closed low south of the Gulf of Alaska will continue
southeastward today and slowly weaken into a positively-tilted
upper trough as its cold front moves through WA/OR on Sunday.
Despite some injection of mid-latitude Pacific moisture, the system
will be progressive and QPF will be limited. Snow levels will be
on the lower side -- 2500-4000ft in the Cascades before lowering
further behind the front to 1500-3000ft. This will bring some snow
to the passes and probabilities for at least 6 inches are at least
50% above about 3000ft or so for the northern Cascades.

Farther east, moisture will stream into the northern Rockies and
eventually into northern/northwestern Wyoming Sunday evening
through Monday and overnight into very early Tuesday, ending from
west/northwest to east/southeast. Amounts will again be generally
light, with probabilities of at least 6 inches at least 50% above
about 5000ft in ID/MT but above 9000-10,000ft in WY.

Front end of the precip shield advancing across the Northern
Plains could support some light icing over northern ND early Monday
with generally a few hundredths of an inch possible.

The probability of significant icing across the CONUS for days 1-3
is less than 10%.

Fracasso


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