Miami this Wednesday

Like Brian, I too am a nervous flyer and my fear is entirely centered on turbulence. I know that turbulence has never brought a plane down, but I really hate how unbelievably uncomfortable and scary it can make a flight, especially a long one. I've done a lot of flying in my life and flown in some really awful flights. But recently, I just haven't been able to bring myself to get on a plane. This Wednesday, I've promised my girlfriend that I'll fly from NYC to Miami with her, but I've noticed that it's going to be really windy in NY on that day and that there are isolated thunderstorms predicted for Miami. Any idea what I can expect at this time of year traveling down the Eastern Seaboard?
Thanks so much!