Winter Storm Outlook Quick Update 7 PM Wednesday, January 3, 2018 6:57 pm GFS This afternoon’s model runs continue with an increase in QPF. NAM 0.70 and GFS 0.38 inches water. With a 1:13 snow ratio, it’s looking like 4-7 inches snowfall at least in PHL. Final models become available about 9:15 PM (NAM). I’ll update then.