Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
450 PM EDT Sun Apr 05 2020

Valid 00Z Mon Apr 06 2020 - 00Z Thu Apr 09 2020


...California and Nevada...
Days 1-3...

A late season winter storm is expected to continue into midweek,
with additional heavy snow accumulations expected across the
mountains of central and Southern California. 

A cold upper low now centered off of the coast of Northern
California is forecast to drop farther south, bringing heavy snows
into the central and southern Sierra, as well as the higher
elevations of the Transverse Ranges Sunday night and Monday. 
Meanwhile, favorable upper jet forcing interacting with moisture
spreading east of the Sierra may produce some locally heavy totals
over the central and southern Nevada mountains.  Overall, the
heavy snow threat is expected to diminish Monday into Tuesday,
although some areas along the Transverse Ranges and the southern
Nevada mountains could receive additional heavy totals.  By late
Tuesday and continuing into Wednesday - as the upper low begins to
move inland across Southern California, the potential for heavy
snows is expected to increase once again across the Transverse
Ranges and southern Sierra, with locally heavy snows possible
along the northern Peninsular Ranges as well.

For the three day period ending 00Z Wednesday, WPC PWPF shows high
probabilities for accumulations of two feet or more along portions
of the southern Sierra, as well as the parts of the San Bernadino
mountains.

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

Pereira