With plenty of low clouds and fog along the Eastern Shore and in some areas close to the Bay early Thursday, there will be some sunshine from midday onward. Temperatures will manage to approach 80, but it probably won’t quite get there. The southwesterly winds that we are expecting to kick in this afternoon won’t be very strong. In fact, the strongest pressure gradient (and therefore, the strongest winds) will be occurring across New England and in upstate New York. Therefore, a corridor from Buffalo to Boston will probably be in the lower 80s, but not Baltimore or D.C. (due in part to the low clouds and fog Thursday morning).
After Thursday, one of those “back-door” cold fronts is going to be pressing southward through New England and into the mid-Atlantic states late Thursday and Friday. And, assuming that the real effective cooling doesn’t occur until Friday night, most temperatures still appear as if they will at least manage to climb back into the 70s again Friday.
In fact, there will probably be a few places near and just to the south of the Mason-Dixon line that will reach the 80 degree mark. We still believe that Baltimore and Washington, D.C. (for example) should reach the low 80s Friday afternoon.