It was defintely an impressive event, especially in PA. Some of the things I noticed in this event that stood out, were better lapse rates aloft and shear. Overall you had higher MLCAPE and better shear aloft. I recall previous events having near 50kts or so around 850, but then dropped as you got near 500. The shear in this one was a bit higher and accompanied by a decent mid level s/w. So this helps sustain mesos that do develop. Also winds screamed from the 200-230 direction just below 850mb. I think this event had winds more veered in that level compared to previous events.