While not unique in occurance, this storm has its challenges:
- It's riding along a front, i.e. very mild air on one side, very cold air on the other
- It's moving quickly
- It's intensifying as it approaches, i.e. larger, stronger winds, higher degree on mixing of the boundry layers.
As a result there is a relatively high degree of uncertainty of the storm center track, north of which will get more snow than rain and south of which will get more rain than snow.