13:27
Fireball causes a considerable explosion. In-game, this spell has a 10 feet radius (take note this is gameplay-wise, lorewise is almost certainly higher).
https://en.uesp.net/wiki/Oblivion:Destruction_Spells
Using Nukemap again for a radius of 3m and we get a yield of 0.000278 kilotons...
2:52
https://en.uesp.net/wiki/Oblivion:Destruction_Spells
The Weak Fireball spell causes a small explosion, which in terms of gameplay is 5 feet in radius (as you can see above compared with a troll). 5 feet is 1.52400m. Enter this into Nukemap and we have a yield of 0.0000506 kilotons for a...
Here will be an archive for calcs from The Elder Scrolls.
Energy
Weak Fireball = 0.051 tons of TNT
Fireball (Oblivion) = 0.278 tons of TNT
Valkyn Skoria shatters platform = 0.782 tons of TNT
Fireball (Skyrim) = 0.797 tons of TNT
Giants send people flying = 0.899 tons of TNT to 1.199 tons of TNT...
25:13
Enemies Explode causes some considerable explosions. At its highest (at least according to gameplay, lore is likely much higher), Enemies Explode has a radius of 20 feet (or 6.09600m).
https://en.uesp.net/wiki/Oblivion:Spells#Destruction
Let's put this through Nuke Map and play around...