Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
342 AM EDT Sun Oct 13 2019

Valid 12Z Sun Oct 13 2019 - 12Z Wed Oct 16 2019

Days 1-3...

...Western Montana...
An open trough crosses the southern Canadian Rockies Sunday night
with Pacific moisture over upslope portions of windward terrain in
westerly flow, aiding potential moderate snow  in northwest MT
Sunday night to early Monday.  Snow elevations would be above
5500ft, so  no lower elevation impacts are expected.  With the
trough moving onto the northern Plains and drier moving in aloft,
snow should quickly taper Mon afternoon and evening.

...Northern Plains to western Great Lakes...

Light snow with local Lake Superior enhancements are expected over
the the arrowhead of MN and northern WI/MI early today as the
upper low and core of cold air aloft crosses. This tapers as low
pressure departs into Canada later today, so most areas are
expected to get an inch or so.

The probability of significant icing is less than 10 percent Days
1-3.
The probability of heavy snow is less than 10 percent Days 1-3.

Petersen