The mid-forecast hand-off is nothing new. I will say, I don't really like that Tracy was given the lead role, as this is Troy's broadcast, but that's neither here nor there. I do have to disagree with you about the tag-teaming being pretty much unnecessary. Now, I don't like being a know-it-all, but I think my (limited) weather training/experience gives me a bit of insight in this kind of situation. As it is in my classroom, as it is in the weather center...two pairs of eyes are better than one, plain and simple. Do they both need to be on-air? Maybe not, but when their putting their maps together, looking at the systems, bouncing theories around, multiple personnel is invaluable.
A little unrelated, but Tracy actually came to our class this week and talked with us about that middle ground, where the training and the on-air forecasting meets. Having the ability to work with someone else, getting into a discussion only helps them get better. In fact, she had such a good time, that she'd like to come back, sometime. [ATTENTION: shameless self-promotion.] They were filming a segment with our lead professor, for a special that will air in a few weeks...and I'm likely going to make an appearance.