Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
338 PM EST Mon Jan 14 2019

Valid 00Z Tue Jan 15 2019 - 00Z Fri Jan 18 2019


...California/The West...
Days 1-3...

Active weather pattern will continue across the West Coast
bringing multiple rounds of heavy snow. Persistent and deep
southwesterly flow and strong upper level divergence will support
widespread precipitation initially across southern California into
Tuesday, including the southern coastal ranges and southern Sierra
ranges. As moisture spreads inland, lighter snow accumulations are
expected across the higher terrain areas of southern/central
Nevada into southern Utah.

A second area of low pressure will push inland Tuesday night
across central and northern CA, which will spread the heavier
snows northward along the Sierra and portions of the southern
Cascades and Klamath ranges. By Wednesday into Thursday, a deep
surface low will approach the Oregon coast and spread additional
heavy snow across the High Sierra and much of the Intermountain
West. 3-day totals across the portions of the Sierras could exceed
48 inches with amounts up to a foot likely across the favored
terrain areas of the Intermountain West.


...Great Lakes...
Days 1-3...

Passing shortwaves and cold air advection across the Great Lakes
region will force localized lake effect snows in the typical,
favored snow belts, particularly downstream of Lake Ontario.

Jackson/Taylor