Easy to tell that the 00z and 06z runs were less then exciting. My recollection is that DT stated he considered N NC as part of the southern mid-atlantic region. I did a Google search for "mid atlantic region" and went to images. Most run from VA up to NY. However, there is certainly some variance - even TN made one map (from some doctor's group). The first image is from Wikipedia. So I'd say there's nothing set in stone as to where the borders for the mid atlantic region is. However, I beleive DT has clearly stated what he refers to as the southern extent of the mid atlantic. I'm not sure where he says the northern boundary is, but I don't really care as well.