Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
418 AM EDT Sun May 07 2023

Valid 12Z Sun May 07 2023 - 12Z Wed May 10 2023

...Northern California to the Northern Rockies....
Days 1-3...

A longwave upper trough positioned along the Pacific Northwest
coast contains several lobes of smaller 500mb disturbances that
deliver occasional rounds of Pacific moisture into Northern
California. Moisture will spread as far inland as the northern
Rockies into next week. The Shasta/Trinity and Cascade Ranges are
expected to see the heaviest snowfall amounts with elevations
>5,000ft having the best odds of receiving snowfall totals >6"
into early next week. The heaviest period of snowfall arrives
Sunday night and lasts into Monday morning as the next 500mb low
approaches northern California. Farther inland, in the
Boise/Sawtooth of Idaho, the Absaroka, Tetons, and Wind River
Range, snow levels will be around 6,000 feet but elevations above
7,000ft will have better odds for snow totals >6". The heaviest
round of snow takes place Sunday morning, with a brief lull on
Monday before another ound of snow arrives on Tuesday. The WSSI
suggests impacts will be capped at Minor, with the Minor impacts
focused in the Sawtooth, Tetons, and Wind River Ranges.

The probability of ice accumulations greater than 0.25 inch is
less than 10 percent.

Mullinax