Just gave it a go on my DS-X. No arm7 fix for this either, thank god.
Seems like this could get pretty boring really quick, but was fun enough for the time being. Basically you control the weather. You have a certain amount of time to do a certain amount of damage to a given city. Like the first level/day, you have 10 minutes to do 8million worth of damage and you only have thunderstorms and tornadoes. There are also little bonus things you can send your tornado over and the tornado will increase in size. Each tornado or thunderstorm lasts about 10-15 seconds. Not sure if it's unlimited or what, but I never ran out in the first day.