Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
347 PM EDT Fri Oct 15 2021

Valid 00Z Sat Oct 16 2021 - 00Z Tue Oct 19 2021


...California/Northern and Central Great Basin...
Day 3...
An amplifying trough approaching the West Coast and turning
negatively tilted by Sunday night will produce precipitation
chances across the southern Cascades, as well as northern
California into the northern/central Sierra Nevada. Snow levels
are expected to be around 6000-7000 ft Sunday morning, but drop to
4000-5000 ft Sunday night behind the front -- resulting in some
isolated areas of heavy snow across the Cascades and the northern
Sierra Nevada. By Monday, high elevation snow chances extend into
the Great Basin, including parts of southern Oregon and northern
Nevada. Models remain rather uncertain regarding QPF amounts, with
latitudinal differences. Either way, isolated instances of heavy
snow will be restricted to areas mainly above 6000 ft.

For Days 1-3, the probability of significant icing (0.25 inch or
more) is less than 10 percent.

Snell