That one is survivable with the help of focused targeting.. you surprise one paladin with Lava Burst + CL + Shock.. it all land at the same time, on an unsuspecting target.. = kill.
Much less dps to worry about after that.

I'm running quad sham with healing priest.


Now, what's really hard is this:
DK (anti-magic, possibly also blood elf for aoe silence)
Prot warrior (aoe stun spam, can also be blood elf, aoe silence)
Retri pala (blood elf for sure, aoe silence)
Rogue/mage (lolhi@burstdps, aoe silence possibly)
Resto shaman (heroism, grounding totem)


It's.. well.. harsh to say the least.


I have come to one conclusion though.. and it is.. DON'T have a button to fire all of your Thunderstorm in one press.. it's so not worth it. With the amount of HP going around these days you will basically never kill people with this sort of thing unless you're lucky. Aim for killing single targets instead, and use your TS in round robin to not get ROFLstomped.. remember.. TS has no diminishing returns and is an interrupt.. it's very powerful as a utility spell and should NOT be used as a dps spell.