How does it work?
To spawn a tornado you will needthe Tornado Spawner. You can craft it, get it through the creative inventory or type /girigirieye to obtain the item.
Tornado Spawner (ID: 1001) - 6 strings + 3 iron ingots
Tap on the ground with the Tornado Spawner to spawn a tornado. If you are in survival mode make sure to quickly run away and watch it from afar, otherwise you might die.