Subj : HVYSNOW: Probabilistic Heavy Snow And Icing Discussion
To   : wx-storm@lists.illinois.edu
From : COD Weather Processor
Date : Wed Apr 17 2024 18:07:31

FOUS11 KWBC 171807
QPFHSD

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
207 PM EDT Wed Apr 17 2024

Valid 00Z Thu Apr 18 2024 - 00Z Sun Apr 21 2024


....Northern Rockies...
Day 1...

Shortwave energy rotating through the Northern Rockies today will
continue to push south/southeast through the region into tonight. A
modest jet streak positioned over CO will continue to put parts of
MT/WY in the left exit region and provide additional lift/support.
Lingering moderate to locally heavy snow is expected mainly over
the higher terrain of western WY where probabilities for at least 4
inches through tonight are moderate to high (above 50%). The bulk
of the accumulating snow is expected to diminish after 06Z tonight.


....Central Rockies...
Days 2-3...

The combination of high pressure building down the northern Plains
providing an upsloping easterly component to cold low level flow,
moisture streaming up the southern Plains, and lift in the right
entrance region to a jet stream over the central Plains looks to
allow snow bands to develop over southern WY and/or northern CO
late Friday into Friday night. As of now these bands may reach
moderate intensity and spill from the mountains onto the High
Plains. The latest PWPF shows high (>70%) probabilities for at
least 4 inches across the terrain areas with a slight to moderate
(30-60%) probability of 6+ inches.



The probability of significant icing is less than 10 percent.


Jackson/Taylor




$$

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