I'm not sure why you would use this over Thundurus. It has exactly the same stats and moveset - Hurricane(rather useless) + a useful Electric STAB Thunder which allows it to kill Kyogre with ease which incidentally Tornadus fails do do with Grass Knot. Hell, Thundurus even gets access to Thunder Wave and Volt Switch, allowing it act as a useful pivot. However, if Tornadus does have some kind of subtle niche( rather unlikely) you should highly stress on that throughout the analysis.
Flying STAB is actually pretty great in Ubers since very few common things resist it, and the ones that do get owned by Focus Blast. (TTar, Heatram, Dialga, etc).
U-turn needs to be an option somewhere for scouting purposes.
I'm not sure how good this would be but maybe try a Bulk Up set?
[SET]
name: Bulk Up
move 1: Bulk Up
move 2: Acrobatics
move 3: Brick Break
move 4: Return / U-turn
item: Flying Gem
nature: Jolly
evs: 4 HP / 252 Atk / 252 Spe
The Defense boost from Bulk Up can give you protection against priority that would normally rip through Tornadus's bad defenses, and STAB Acrobatics is pretty powerful and runs off of Tornadus's solid base 115 Attack stat. You can strike at most Ubers' weaker physical defense as well. Acrobatics is STAB, with Flying Gem you hopefully have enough inital power to blast through the foe's physical tank so you can continue sweeping with you new base 110 STAB attack. Brick Break is for Steel-types and screens breaking. It owns Tyranitar but likely won't kill Heatran or Dialga wiyhout prior damage, so watch out. Return is your best attack against Zekrom, but U-turn can be used for scouting and softening up walls.
You also have the advantage of your best STAB not being weather reliant like Hurricane is. You're also not outclassed by Thundurus since it doesn't learn Acrobatics. :P
Its worth trying at least.
