They launched a Delta Rocket when I was in Melbourne prior to my trip down to Vero on May 18th. From Melbourne you could see it, but it was primarily a contrail that went from the ground to the sky. I would recommend that you use that opportunity to drive up for the launch and take the tour at Cape Canavaral if you haven't done so. It's about $25 per person, but is very interesting and educational.
If it is going to be a night launch, it might be visible better.