I'm not sure if this is what you're looking for or not but Heather Tesch was the weekday early morning met. at WCCO in Minneapolis in the late 90s and early 00s. And she was TERRIBLE. She looked a lot different (somehow ten years ago she looked twenty years older than she does now) but that was the least of her problems. She had the most awkward presentation ever and was always stumbling over words and didn't speak very clearly...her tone was especially weak. You can see some of this in youtube clips from the early 2000s. I can't emphasize how awkward she was, both in delivering the forecast and interaction with the anchors.
When she left I almost assumed she was fired, because she simply wasn't good at all. The other 3 morning mets on other stations were superior. Imagine my surprise to see her turn up at TWC, hosting YWT. I can't believe the transformation not just her looks but most importantly her presentation...a complete 180 turn. It's unreal and I've always wondered how she was able to so dramatically improve.