Introduction[]
Doing this to check Liger686's calc, since it could be a huge upgrade. Basically, an alien based off Navajo mythology known as the Yee naaldlooshii. It creates a huge thunderstorm with just its presence alone.
Calculation[]

So the camera is more or less at it's angle. The monster is utterly huge, so I'll use 2 meters. Using the calculator, we get a distance of 5.1 km en radius.
A = pi *r^2
pi * 5.1^2 = 81.71 km^2
Kinetic Energy[]
Storm clouds are around 13 km iirc
Volume = Area * Height
81.71 * 13 = 1062.23 km^3
Or 1.06223e+12 m^3
Density of Clouds are 1.003 kg/m^3
1.06223e+12 * 1.003 = 1.0654167e+12 kg
The thunderstorm starts at 1:21, as that's when Gwen hears something and notices it forming and is fully formed at 1:28. So 7 seconds, give or take.
5.1 km / 7 seconds = 728 m/s
1.0654167e+12 * 0.5 * 728^2 = 2.823269e+17 J
67.47 Megatons
City level+
Wattage[]
Yare Yare hurricane produces 6*10^14 Watts per 665 km^2
81.71 / 665 = 0.12
6*10^14 * 0.12 = 7.2e+13 J
17 Kilotons
Town level