One problem with that set is the powers that do sleep and damage over time. Mainly cause sleep is interupted by damage, so the power wouldn't sleep them atall tbh.
Er, sleeps with DoT? No AoE hold? And perhaps you should switch Lift and Wind Trap, all control sets have a hold as first or second power (iirc).
How would Twister work? Knockup on target, knockback on the others near it? Who would then be knocked down and/or repelled? Is it a pet like tornado , or is it a one shot power?
And please no Gale on Storm Cloud.
Like the Cyclone idea tho not sure how good it would work out in practice. Perhaps it should be a toggle?
Icelock - Ice/Storm Controller
Command Bot 1 - Bot/Traps MM
damn, didnt mean to put a DoT on it, it started out as a hold, but then suited sleep more. 
The twister functions like Psionic tornado, it lifts one person up, and hurls the others away.
I didnt think to put an AoE hold in when I had an AoE sleep, so if it suits more to have a mass Wind trap, then so be it 
A total of 14 of my nerves have been harmed in the making of this post...
Find a different name for Vacuum maybe? Not sure what that name has to do with storms.
Or how about replacing it with something like: Fog Bank, which is a small cloud that reduces ToHit and slows the target since he can't see where he's going.
Disclaimer: The above may be humerous, or at least may be an attempt at humour. Try reading it that way.
Posts are OOC unless noted to be IC, or in an IC thread.
Vacuum is a fast spiral of air that cuts off the oxygen supply of enmies rendering them unconcious
I was gonna do fog, but realised thats more a Summoning power.
A total of 14 of my nerves have been harmed in the making of this post...
I like it, sounds a bit like Storm Summoning though
Just an Idea, i think storms can fit into a control powerset (and it makes sense to have control over storms) so I managed to have a look at the control powrs and came up with this:
1) Vacuum (Sleep, smashing DoT)
2) Lift (knockup, smashing DoT)
3) Wind Trap (Hold, cold DoT)
4) Cyclone (target Hold, Foe repel)
5) Mass Vacuum (AoE Sleep, smashing DoT)
6) Hail Storm (AoE Cold/Smashing DoT, slow, -acc)
7) Twister (Target Knockup, AoE Knockback, Knockdown, repel)
8) Chilling Wind (cone Slow, -Acc -Res)
9) Storm Cloud (Summon Cloud) (powers: Thunder Clap, Gale, Ball Ligtning, Ice Bolt, Chilling Wind. Resistance: +smashing +lethal +Psi +Energy +toxic -Negetive -Fire -Cold)
A total of 14 of my nerves have been harmed in the making of this post...