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A dragon summons a storm on a mostly clear blue day. Keep in mind this is not a legendary super powerful dragon, or even a named dragon. This is just a generic
nameless dragon.
https://forums.elderscrollsonline.com/en/discussion/493609/pts-patch-notes-v5-2-0
PTS Patch Notes v5.2.0 said:
Frost & Storm Dragons
Frost and Storm Dragons from the far reaches of Tamriel have come out of hiding. Drawn to Elsweyr by their brethren, these fearsome creatures bring unique and devastating destruction magic to bear on those brave enough to face them.
- Frost Dragons summon fierce winter storms and cause frozen spears to burst forth from the ground. Storm Dragons call lightning from the skies and annihilate foes with fearsome blasts of shock magic.
- Rumors of Dragons that manipulate the flow of time have also spread through the taverns and caravanseries of Elsweyr, as have tales of long-dead skeletons erupting from the earth to serve Draconic masters.
- The creatures themselves have grown bolder, chasing enemies across the battlefield to rip into them with tooth and claw. Dragons tire of their environs and take to the skies when they are not engaged, so those who dare challenge them must be prepared to fight or give chase.
- These new Dragons and Dragon behaviors are found in both Northern and Southern Elsweyr!
Given it's a storm cloud, and storms are created by cumulonibi, we'll go with the height of a cumulonimbus,
which on average is 12,000m.
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
That's impressive, but we can also get the kinetic energy, as we can clearly see the clouds moving in from the horizon.
1.22 seconds.
T = 4700m/1.22s
= 3852.45902m/s
KE = (0.5)mv^2
= (0.5) X 416386690.5 X 3852.45902^2
= 3.08988915e15 joules
Now to add both together for our final results.
E = 9.41033921e14 + 3.08988915e15
= 4.03092307e15 joules
= 963.4137356596557993 kilotons
Final Results
Generic Dragon Storm Call = 963.414 kilotons