Kenshiro is stated to split the whole sky, let's calculate it.
Split in the cloud =83
2atan(tan(70/2)*(83/1023)) Angsize equation plugged in = 6.503023159614
Cloud altitude is 2K meters
Size of the split = 227.24 meters
thunderstorm diameter, cloud height and size of crack
Rectangular prism volume = 7.64e10 m^3
7.64e10 x 1.025 = 78310000000
Judging from these two scans, I have faith in saying that the sky itself splits in 5 seconds (mostly due to the sky splitting when Kenshiro fist strike Falco)
0.5 x 78310000000 x 4800^2 = 902131200000000000 joules | 215.614531549 megatons of TNT aka Mountain Level
Not sure why, but I feel like I may of forgotten a few variables.