With what appears to be 3 snow threats for the Middle Atlantic States & Southern areas of the Northeast the first of the 3 events appears to the the WEAKEST of the bunch. All of the systems in play are going to hinge on the strength of blocking over Greenland and how strong that blocking is or isn't. A stronger block would be colder but it would also suppress weather systems further south. A weaker block and we have systems that move further north.
Weather models seem to all be showing a narrow band of snow for Friday. The European which through last night showed nothing with this lead system now has some snow from NYC & Long Island southward. The Canadian and GFS model are similar in their tracks. The Canadian was way north with this through last night and now lines up with the GFS...read more at http://www.meteorologistjoecioffi.com/index.php/2017/03/06/snow-threat-friday-weakest-3/