Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
338 AM EDT Wed May 04 2022

Valid 12Z Wed May 04 2022 - 12Z Sat May 07 2022

...Central Rockies...
Day 1...

Closed mid/upper level low over the Colorado Rockies this morning
will continue to push eastward Day 1. Sufficient moisture beneath
the cold pool will continue to produce moderate to heavy snow this
morning for the higher terrain, including the Wind River Range in
Wyoming, Uintas, and into the northern CO ranges. An additional 6
inches or more is likely in these areas before the system exits
the region this evening.

...Pacific Northwest...
Days 2-3...

Nose of an extended N. Pacific jet ~130+ kt will move into Oregon
Day 2, with the left exit region providing broad lift through the
Pac NW. PW values of +1 to +2 sigma will precede a weak boundary
at the surface, promoting some snow at high elevations as snow
levels will be above 5000ft to start. On Day 3, the main moisture
plume will sink south of the area but a mid-level shortwave and
associated surface wave will move into the region with another
round of heavier snow for higher elevations above 5000ft, but snow
levels may lower by the end of Day 3 as colder air pushes in.
Two-day totals may exceed two feet at the highest peaks.


For days 1-3, the probability of significant icing is less than 10
percent.

Fracasso