Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
413 AM EDT Sun Mar 17 2019

Valid 12Z Sun Mar 17 2019 - 12Z Wed Mar 20 2019

Overall, a quiet period with respect to snow/ice is expected to
continue across the Lower 48, with models showing little potential
for widespread significant snow/ice through the early part of the
week. 

Models show a strong upper ridge building and shifting east from
the Pacific Northwest and British Columbia to the Rockies this
period.  East of the ridge, an amplifying shortwave is forecast to
settle south from the northern into the central Plains on Tuesday.
 Upslope flow behind a weak wave developing and moving east from
the High Plains is expected to support some accumulating snows
along the Colorado Front Range and Sangre de Cristos, as well as
the San Juans mainly east of the Divide -- with WPC probabilities
indicating a Slight to Moderate Risk for accumulations of 4-inches
or more during the Day 3 Period (ending 12Z Wednesday).

Farther west, a negatively-tilted upper trough will push into
California Tuesday night into Wednesday, with accumulating snows
for Sierra.  WPC probabilities show a Slight Risk for
accumulations of 4-inches or more for areas above 7000 ft during
the Day 3 period.

Pereira