Yup...once you get into about mid February through mid March the swings can be pretty enormous. It's unlikely any one pattern regime truly dominates for more than several days just because of the changes which are going on within the hemisphere.
In terms of temperatures and next week, I think its a very difficult signal. I think overall, the AO/NAO/PNA structure point towards more average to slightly above average...but that isn't a bad thing when talking about the potential for an increasingly active pattern. Some of our best snows and stretches come in that sort of regime.