In a similar vein, how does snow affect hub operations up North? I mean, there are so many northern hubs - DTW, CLE, EWR, ORD, MSP just to name a few. How much snow does it take to really clog the system up?

I'm connecting at EWR on 12/21/05, and would like to think only an unusually bad storm would seriously affect schedules.... Right? Wrong?