My wag at GFS sounding analysis for immediate 495 area is that 12z Monday is probably snow with heavy rates and a tiny layer at freezing more or less. 18z is probably sleet with lighter rates and a wider warm layer. Reminder that as we get closer, NAM and Euro profiles will be more accurate for assessing p-types.
p.s.: we all should be rooting HARD for that ULL/CCB snow area to verify/intensify/biggify. Soundings for that are gorgeous. That is some 12-15:1 champagne powder on the GFS.