I know this was posted earlier but just noticed kbuf mentioned snow ratios..
As the upper wave approaches by the evening Saturday, a curved
coupled upper jet crosses the region concurrent with the arrival of
a fairly deep deformation band and frontogenetical maxima that seem
to be largely co-located with the dendritic growth zone. This should
allow for rapidly increasing snow-to-liquid ratios (from about 20:1
over the northern CWA to about 14:1 over the southern portions of
the CWA) by the evening hours as the best forcing for ascent arrives
into the Southern Tier, then proceeds northward toward the
Buffalo/Rochester area.