Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
359 AM EDT Sat Mar 23 2019

Valid 12Z Sat Mar 23 2019 - 12Z Tue Mar 26 2019

...Ranges of CA/Great Basin/Rockies...

Days 1-3...

A couple of systems will move across the Western US through the
forecast period, bringing a few rounds of snow mainly to the
higher elevations.

For tonight through Sunday, a shortwave trough will push onshore
northern California and the Pacific Northwest the move northeast
through portions of Idaho and northern Nevada. With favorable
forcing for ascent, the highest accumulations are expected in the
mountainous areas of eastern OR, central ID, and portions of
northern NV. In addition, several inches can be expected across
the UT Uintas thanks to favorable orographic lift. As the system
spreads northeast for Sunday and Sunday night, the accumulating
snow will move across the northern Rockies, portions of northern
WY as well as the Colorado Rockies where accumulations of 2-4
inches (locally higher) are expected.

A second shortwave trough then pushes into California Monday night
into Tuesday. This will bring copious amounts of moisture and with
snow levels to 4000 to 6000 feet across northern CA. Several
inches of snow is expected with the highest probabilities across
the Shasta/Trinity/Siskiyou/Sierra ranges.

The probability of significant freezing rain is less than 10
percent.

Taylor