Firstly would like to commend @Belveline for his build guide marvelheroes.info/build/3718/#p3, build is based off lots of good information in there!!

My build:

CC immune/survival CR 52

CC immune is an affix a lot of people have told me to avoid on storm, but proper investment into power duration makes the irresistible freeze of storm surge (with freezing tempest) makes for a smooth run.

Precision/Tactics CR 41

Storm is well known for AoE but with good positioning do not under estimate the damage of chain lightning. I actually consider precision a bonus.

Tactics has become much more manageable after free travel powers update.

Precision/skill CR 52

Once again dont underestimate the power of Storms single target. Even with the area powers at half strength the extra +50% to non area and 25% overall make electrocute and chain lightning very dangerous.

Fortitude CR 67

No medkits make for a messy run. Would not recommend

Endurance CR 62 (6:57 with 2 deaths)

My build is too squishy for random damage not to be healed up. Would not recommend.

Blood/Lightning CR 43

The easy ones. With life on hit from Fragment of Twilight blood and regeneration from healing winds passive, blood is an easy price to pay for unlimited spirit. Lightning is self explanatory.

Affixs

recommended: +energy damage, +ranged damage, precision (with this build only), lightning, blood, damage amplification zones, barrels, cars (can bounce chain lightning off of), turrets

Medium threat: Hidden hazards, teleporting, crowd control immune, contagious, ground hazard, duplicate boss, restraint, skill

Neutral: Utility, gargantuan, dimunitive, +melee/phys/mental

Avoid: Brutality, Fortitude, AIM scenarios (too many projectiles), Endurance, Aerial Hazards

Keys to success

Kakaranthara omega node: In danger room, you spend much more time fighting packs of normal/elite mobs than bosses, so the 240 points for 1800 damage rating is crazy.

Freezing tempest and storm surge: Must have. At level 21 after gear, with 86% power duration and 2.2 freeze it ends up being a 4.09s irresistible CC on a 6 seconds effective cooldown. Ranks into this skill with an improvement in power duration can be used to further increase crowd control up to 100% by @Yespa marvelheroes.info/build/38973/

Tanky team up: Positioning behind groot or a good line of sight disruption can really make a difference in survival, and take care of any +not targetting you effects you may have in your build.