The CBS weatherman is Mark (and I'm going to mess up his last name) McKewan or something like that. Al Roker is on NBC.
Bryant Gumbel is annoying, arrogant and a womanizer, but I don't know about the alcoholic part. I've never heard anything about that. I sort of enjoy watching him - he may be arrogant, but he's also a pretty good interviewer.
And I'd never say he's obese - I bet if you saw him in person, you wouldn't say he's chubby either. The camera has a way of being unflattering.