So, a small hint on this fight.

In phase 2 (tornado alley); you have to run through the tornado maze to the end of the hall. At about 11-12% hp, the raid team, minus the tanks, should jump into the slipstream (sides of the 'alley') and let it carry them all the way to the other end of the room. Let the tanks + dots push the boss to 10%, where he will jump across the room, landing right where the rest of the raid team is waiting. In this method, you can effectively only have to navigate tornado alley once - which seems the be the hardest part of this entire fight... especially if you don't have a druid on the team. Remember, no tanks are needed in phase 2, he does not melee - so if the tanks die, its not a problem. (sorry tanks)...