Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
240 PM EST Sun Jan 13 2019

Valid 00Z Mon Jan 14 2019 - 00Z Thu Jan 17 2019


...California/Great Basin...

A closed low dropping southeast across the eastern Pacific toward
Southern California on Monday will slow as downstream ridge
remains anchored over the western U.S.  Models show this system
weakening and lifting the northeast behind the ridge and ahead of
the next approaching system.  Deep southwesterly flow and good
upper level divergence along the base of the trough will support
widespread precipitation across Southern California late Monday
into Tuesday, including some locally heavy snows along the
southern coastal ranges and the southern Sierra, with lighter snow
accumulations further east into the higher terrain of southern and
central Nevada and southern Utah.  This system lifting to the
north along with an approaching upstream wave will focus snows
further to the north along the Sierra and into portions of the
southern Cascades and Klamath ranges late Tuesday in Wednesday.

Pereira