Sometimes the primative ideas are the best ones. I think you're actually on the right track there. The trick is to "attack" the storm while it's still a forming tropical depression, and not wait until it turns into a raging hurricane. But I like the concept - when you see the storm forming, break it up before it has a chance to grow. The question would be, if you dropped some sort of "pressure bomb" (or thermal one) into the eye of the storm to try and break things up, how long lasting would that effect be? How long before temperature and pressure returned to their "pre-bomb" state? Would it be sufficient to permanently break it up, or just delay the inevitable?

Why is it that some tropical depressions don't grow into hurricanes while others do? I'm sure that's a question climatologists have been trying to answer for decades. You'd like to think that if you could isolate a series of events that caused a TD to break up, then the only remaining challenge would be to artificially create those same events, thus giving you the ability to "prevent" a hurricane.

Therein lies the challenge.

Until then, keep your eyes on the skies, and stay safe!