It would be useless.
Your garden variety thunderstorm actually much more powerful than any bomb the US or anyone else has in their arsenal or could ever produce. The typical tropical system is comprised of hundreds of thunderstorms, all of them at the core of the hurricane are more violent than any we will see on land. So a tropical system would easily survive any attempt to destroy it or change it's course.
In addition, while they are very destructive, they are also a very important mechanism in balancing out the energy distribution on our planet. If we could actually influence tropical systems, messing with Ma Nature in that way would likely lead to WAY bigger problems down the road. Best thing we can do as humans would be to be much better prepared to deal with them. They are certainly NOT going away!
-John