I don't think there is any good 'rule of thumb' for defining a track confirmation.
But just for argument's sake...
At what point do you think we can say that Franklin is definitely being influenced by either synoptic feature.. the E'rly Trough or the infamous west Atlantic ridge?
I guess along with that, we'd have to agree in the real circulation center, too.
Maybe this whole discussion is why we have these boards and pay learned academics to study and "predict" weather!




