from my observations storm seems to treat procs as chance on cast. You can't, however increase their haste in any way, so with the speed they attack I sorta wish it was checking every ten seconds instead.
Lightning storm inherits the ability to proc from you, so what happens is that each of its thunderbolts has a chance to proc.
As for tornado, I hear that it's bugged and will only roll a proc chance when it's first summoned, but I've never verified it.
Lightning Storm will chance to proc on each enemy damaged. So not just on each bolt, but each target. So if you hit 5 guys (the cap) LS will have 5 chances to proc. However things that would normally grant an effect to you (like build up) will grant the effect to LS, so they usually aren't a good choice.
I haven't tested recently, but I don't think Tornado is broken. It will work like a toggle power and check for the proc once every 10 seconds.
Draggynn on Virtue: lvl 50 Storm/Psi, 1389 badges
Draggynn's Guide to Storm Summoning(Gale-Tornado, updated 6/25/2011)
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ok, works pretty much as i figured, thanks for the response guys.
Lightning storm has a chance to hold each target it hits each time it fires if you slot it with a dev chance to hold. As does any procs you use in tornado, etc. When the pet causes damage it has a chance.
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My search foo is weak, what I'm wondering is if IO procs (dam, hold, stun etc) slotted in tornado and lightning storm proc every ten seconds as with patch powers? or do they have a chance to proc everytime they damge a target.
I have a feling that procs in Tornado are every ten seconds, but I sm undure of how they might work in Lightning Storm.
Thanks for the help.