Models are aggressive with storm's developing from the deep southern jet stream branch with occassional diving northern jet stream branch with cold shots, these two streams could combine to produce three snowstorms this week.  Sunday night/Monday, Wednesday/Thursday, and again the following weekend all threat timeframes for substantial snowfall.  18z GFS produces 12-18" of snow over CHH the next 7 days.  Models are in two groups, it is pretty much the EURO vs everyone else.