It can be done, but it will be no walk in the park. The first issue to address would be wind direction.
We know that if your towers can shoot different angles, the current wind direction will affect them all differently, which would lead me to believe you would need to trigger every projectile instead of using the data editor.
Based on that fact alone, I would forget it if I were you. If it was just one projectile, or one tower in your TD it would be realistic, but triggering potentially thousands of projectiles would be an absolute nightmare. Plus, the mathematic equations involved in something like that when coupled with missile height, collision detection, and missile arcs would be nothing short of mind blowing. By all means, attempt it if you wish though :S.
Couldn't you create a behavior that can stack and applies a force? And then when the wind changes, have the behavior casted on each projectile in play (and applies current behavior values to any projectiles created). And have the source of the behavior be the direction of wind and have the strength of the wind be the stack count?
Something like that...?
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.