Have you ever watched Beyond Belief Fact or Fiction on Chiller? They had a story just like this where this weather guy was coming up with all these wild and false weather predictions for the same purpose to improve ratings. And his last prediction was a tornado. The night the tornado was predicted it was clear and calm as the weather man was on the road. A storm develops out of no where spawning a tornado that took the life of the weather man. Now I'm sure some parts of that story are urban legands but sounds like what your describing.