Dynamic Weather Effects

I'm not sure if anyone has put this yet but Dynamic Weather would be awesome! This would include Rain and snow and even go as far as to maybe have tornadoes and hurricanes into the midst. It would add another real life element and even add a little fear/strategy to the game!

Seeing as most wreckfest races are 3 to 6 laps long the weather would have to change awkwardly quickly to be even noticed