I was asked to share my build for storm on COA.

Pretty simple and easy build. It works well due to the 50% decreased cooldowns.

I am stacking attack speed for the spammable Electrocute. Everything else we use on a timer or on CD.

Start with the 3 aoe dots (Lightning Storm, Crashing Hail, Sudden Tornadoes). Hit the Signature. This will fill the Tempest bar and allow the use of Storm Surge and Billion Volt Strike. Spam Electrocute until you need to refresh the dots or anything comes off of CD. 

With the cooldown reduction, we can keep her in Tempest Surge 100% as long as you have a minimum of 750 Tempest, also her Signature has a very short cooldown. There is no need to take Healing Rain talen in row 3 for the increased CD reduction unless you need it for more survivability. The pull from Storm Vortex is a phenomenal CC ability that I find also increases survivability by interupting enemy abilities.

She has phenomenal AOE, but was lacking ST damage for bosses. I found that Sudden Tornadoes will all stack on the boss if only 1 is present, so I opted for the extra tornado and extra wind damage. Electrocute also seemed to be the best ST spam she has available especially with high attack speed.

Update:

Added in Essence of Jinn. Keep in mind her regular uniques are all viable, I just happened to have some good luck on these.

Food for though for lower IPs and other routes for damage:

Substitute Artis with Crit Hit such as GotK, Edge of Infinity, and ignore the attack speed route. If you do this, you will crit more often but your spam will hit less frequently. It's a trade off. Just depends what you want to see. 

Also think about substituting Bow for Shield of Persues for the increased survivability if you are dying too much