Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
514 PM EDT Thu Apr 02 2020

Valid 00Z Fri Apr 03 2020 - 00Z Mon Apr 06 2020


...Northern Plains/Upper Midwest to the Mid Mississippi
Valley/Central Plains and Rockies...

Day 1 (ending 00Z Sat)...
A well-defined shortwave moving east of the northern High Plains
will continue to push a sharp cold front east into the upper and
mid Mississippi valley.  Favorable upper jet forcing is expected
to support additional light to moderate snows across eastern North
Dakota and northwestern Minnesota through the evening into the
overnight hours, with WPC PWPF indicating that additional amounts
of 4-inches or more are likely along and east of the Red River. 
Meanwhile, a wintry mix will advance farther east across
Minnesota, with WPC PWPF continuing to show high probabilities for
ice accumulations of 0.10 to 0.25 inch across portions of central
Minnesota.  Models also show favorable upper forcing supporting a
second area of organized precipitation farther to the south across
the central Plains into the lower Missouri and mid Mississippi
valleys on Friday.  Here too a wintry mix may produce impactful
ice accumulations across portions of eastern Nebraska and Kansas
into western Iowa and northern Missouri.

Day 2 (ending 00Z Sun)...
As the supporting shortwave begins to lift north from the upper
Midwest into Canada, light rain changing to a wintry mix is
expected to result in mainly light snow and ice accumulations from
eastern Iowa to the U.P. of Michigan late Friday into Saturday.

...Pacific Northwest and Northern California...

Days 2-3 (ending 00Z Mon)...
Heavy snow is expected to return to the region as a deepening
upper low approaches the coast Saturday night.  By Sunday, heavy
mountain snows are expected to become likely from the northwestern
California ranges to the northern Sierra, with WPC PWPF indicating
locally heavy accumulations of a foot or more likely by late
Sunday.

Pereira