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Calc request for @NightmareCinema
Arf summons a storm that covers a city in moments. The average floor height is 10 feet, or 3.04800m.
5 pixels = 3.04800m
1 pixel = 3.04800m/5 = 0.6096m
0.6096m X 980 = 597.40800m
2 seconds and 3 frames
T = 1s/25
= 40ms X 3 + 2s
T = 597.40800m/2.04s
Now for the volume of the storm cloud (given it's a storm cloud, height as a cumulonimbus, or 12000m). It spans the horizon too, so that's at least 4km (4000m) in radius. Volume as a cylinder.
V = πr^2h
= π X 4000^2 X 12000
Density of a cloud is 1.003kg/m^3.
M = 6.03185789e11 X 1.003
Finally for the energy.
E = (0.5) X 604995346367 X 292.847059^2
= 2.59420189e16 joules
= 6.2002913240917783 megatons
Arf summons a storm = 6.20 megatons