It seems likely that many areas in metro new haven and Hartford will see 20″ of accumulation.
Around new haven an additional 1-3″ is likely. This would result in the biggest snowstorm since January 1996! The presidents day storm in 2003 may play spoiler here but I think this storm will eek out on top.
Around Hartford an additional 3-5″ is likely. This would result in the biggest snowstorm since february 2006. Bradley likely has over 16″ of snow which would put this in the top 10. It’s possible they could come close to the top of the list but they will likely fall short of the 21.9″ record.