This is a potent storm and it can "make" its' own cool air by pulling it down from aloft via heavy precipitation. However, these marginal temps will eat away from the totals. It is also important to watch mid-level temperatures (5,000 to 10,000 feet) because a warm layer could produce sleet for a couple hours. This could also eat away from the accumulations. Nonetheless, this is a massive storm and it will produce some impressive snow totals.
I'm still sticking with my snow map posted earlier today. I hope to have another update tomorrow.