Subj : HVYSNOW: Probabilistic H
To   : All
From : Mike Powell
Date : Sun Apr 26 2026 14:33:00

FOUS11 KWBC 260557
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
157 AM EDT Sun Apr 26 2026

Valid 12Z Sun Apr 26 2026 - 12Z Wed Apr 29 2026

....Great Basin, Central/Southern Rockies, & the Black Hills... Days 1-3...

A broad longwave trough over the western U.S. will direct a pair
of 500mb shortwaves troughs across the Intermountain West today and
the first half of the work week. A 250mb jet streak will place its
divergent left-exit region over the Central Rockies, while ample
700-300mb layer moisture streams overhead, providing an ideal setup
for mountain snow that extends from the Great Basin on east to the
Black Hills. Snow levels over NV/UT dip from around 8000ft to
about 7500ft while 9000ft snow levels in CO drop to 8000ft Sunday
evening. The heaviest snowfall will occur on Sunday from the
Wasatch and Uinta on east to the CO Rockies and northward to the
Wind River and Big Horn Ranges. As the longwave trough continues to
see spokes of 500mb vorticity maxima move through, light-to-
moderate snowfall will linger over the central and northern Rockies
through Monday and even into Tuesday.

72-hour WPC probabilities show high chances (>70%) for >12" of
snowfall in the peaks of the eastern NV Great Basin, the
Uinta/Wasatch, and the CO Rockies above 9,000ft. Similar high
chance probabilities exist for >8" of snowfall in the Wind River,
Tetons, Absaroka, and Big Horns. These peaks sport lot-to-moderate
chances (20-40%) for localized snowfall totals topping 12" through
Tuesday. Only the highest mountain passes will get impactful snow, so
the impending snowfall will mainly be a beneficial event for these
drought-stricken area.

The probability for significant icing over one-tenth of an inch is
less than 10 percent.

Mullinax
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