There are 12 levels of upgrades for the Storm

Multiplier at max level: x4096


Upgrade Cost
Heavy Rain 6,000,000,000
Rolling Thunder 60,000,000,000
Lightning Storms 600,000,000,000
Louder Thunder 6,000,000,000,000
Supercharged Bolts 60,000,000,000,000
Booming Thunder 600,000,000,000,000
Torrential Rain V1 6,000,000,000,000,000
Torrential Rain V2 120,000,000,000,000,000
Torrential Rain V3 2,400,000,000,000,000,000
Torrential Rain V4 48,000,000,000,000,000,000
Torrential Rain V5 960,000,000,000,000,000,000
Torrential Rain V6 19,200,000,000,000,000,000,000

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