Depending on the timing, I might end up learning early enough that I won't be able to fly that I can hop in the car and drive down from Ithaca. What would really suck is getting to Pittsburgh and only then being told I can't get to TN. (My layover at PIT is pretty long, over two hours, so that's a real danger.) I wouldn't mind too much getting delayed on the way back, but if there's a problem flying down tomorrow, it's unlikely to clear up in time for the wedding. My best bet would be to get on a plane back to Ithaca, at which point driving to TN wouldn't work as well.
I've already heard from some friends in Alabama that they're OK (phew!) and hope to hear the same from others later today.