1:34
(I'll add a gif later)
Charlie the Bubblegum Monster creates a horizon spanning storm. Storm clouds are cumulonimbus, which on average are 12,000m tall. The distance to the horizon from the viewpoint of the average height is 4.7km, or 4700m. Volume as a cylinder.
V = πr^2h
= π X 4700^2 X 12000
= 8.32773381e11m^2
Density of a cumulus cloud is around 0.5 grams per m^3.
M = 8.32773381e11 X 0.5
= 416386690500g
= 416386690.5kg
Condensation of water vapour to liquid is 2260 joules per gram.
E = 416386690500 X 2260
= 9.41033921e14 joules
= 224.912505019120459 kilotons
Final Results
Charlie summons a storm = 224.913 kilotons