Hurricanes transfer heat energy from the Tropics to the temperate North. Suppresion of them would cause the energy imbalance to build up, making the next storm worse. Directing the storms away ftom land would be safer.
For example maybe trade winds and currents simply speed up a bit if there’s no storm.
Just like how we worked hard to prevent wildfires and then realized that wildfires have a rejuvenating and positive effect on forests and the local environment.
Now tornadoes. That seems like the mosquito of storms. It doesn't seem to serve any purpose. Wouldn't mind if we got rid of or could direct tornadoes to save lives and resources.
Not too long ago a hurricane or some big storm was off the US east coast. It didn't land but it veered northeastward.
I remember the weatherman saying with relief the storm has gone out to sea so everyone is safe.
Only it wasn't going out to sea it was headed directly for my region the Maritimes in Canada.
Directing a hurricane away from land may just be sending it to someone else.
I'd expect there would be turbulence around the entrance to the walled area which might be dangerous, but that could probably be addressed be having the walls flair out near and beyond the end of the runway, and also past the end have the height ramp down to 0 instead of just stopping abruptly.
”Rozenburg wind wall in Rozenburg, Netherlands, is a wall built to block wind from entering the Calandkanaal, and ease the passage of large cargo ships through the narrow canal, particularly through the Calandbrug bridge. The wall blocks about 75% of the wind and allows the ships to pass smoothly. The wall is 1600 meters long and it is made up of 125 rectangular and cylindrical slabs, each about 25 meters tall and 18 meters wide.”
Edit: beter photos at http://googlesightseeing.com/2013/05/rozenburg-wind-wall/. That page points to a dutch-language video that shows hoe tight that passage is: https://youtu.be/H4ZIMXjMRJk?t=3m5s