Tempest Tornado is the final upgrade on Path 1 of the Monkey Apprentice for Bloons TD 5 and is the last upgrade for the Monkey Apprentice in Bloons TD 4. It pops bloons once before blowing them back and blows more back and further than its lesser counterpart. However, like Summon Whirlwind, it removes glue and ice. When this upgrade is purchased in BTD5, the Disciple of Air's name will change to "Master of Air" (Or "Monkey Wizard" in BTD4).
The Monkey Apprentice's normal tornadoes will turn into Tempest Tornadoes when it has this upgrade rather than using both normal and tempest tornadoes.
In BTD4, when upgraded, this tower's name will change to "Monkey Wizard".
In BTD6, the 0-0-0 shares the same name.
Before, the player could almost get infinite money with a Sun God at the entrance and one of these at the mid-end of the track when there are regrowth bloons on the screen. The Sun Gods pop the excess bloons and the Master of Air can send them back to the entrance and giving them time to regrow. This is known as Regen Farming.
However, this is now fixed as Regrowth Bloons no longer give cash for the regrown layers.
However, it still works on bloons that spawn more than one bloon when popped, which are Black Bloons, White Bloons, etc.
The Master of Air appears to be standing on a cloud, much like how the Master of Fire standing on a sun.
However, a Master of Fire is not standing on the sun in the upgrade photo unlike the Master of Fire.
In BTD5, tornadoes from Master of Air are bigger than normal Summon Whirlwind, and is dark violet instead of gray. Also, tornadoes has lighting bolts. In BTD4, the tornado has a more stormy effect as it is constantly displaying lightning bolts out of its side as opposed to BTD5, where lightning bolts flash just once before the tornado dies out.
This costs $3000 more money than Summon Phoenix on the second path in BTD5.
The Tempest Tornadoes can go out of their range unlike the Summon Whirlwind's. They go twice as fast too.
In BTD5, The Tempest Tornadoes can only blow away 70 bloons, unlike in BTD4 when they can affect 120 bloons.