The turn toward LANNA worked well, but the cell of severe weather near KABE was threatening. I requested a 20 degree left deviation from the Allentown Approach controller soon after passing LANNA, and found a few bumps on the way over to the FLOAT intersection (just above Reading (KRDG).
I'd had a very useful conversation with a young Lockheed-Martin Flight Service briefer at about 1830Z (I assess his youth based mostly on some of his vocabulary choices) wherein my attention had been drawn (full points, young man!) to developing convective weather between Pittsburgh and Altoona. Given the time that would elapse between that very good briefing and my proposed departure, that patch of weather would bear watching.
Reflecting on the flight, if I'd had to depart about a half-hour later it would have been very dicey dealing with that frontal line of convective weather. The backup plan would likely have been to plead with ATC for a routing down V16 over New Jersey - although we all know how much they like to do that.
Here, courtesy of FlightAware.com, is the track for the entire flight, with the weather depicted for about the time N631S and I were just south of Allentown.