1. NO HUMAN CAN CREATE A THUNDERSTORM!
A thunderstorm is created by warm air rising, and condensing into a cumulus cloud. As more warm air gathers the cumulus cloud will continue to enlarge. Soon the water droplets forming in the cloud will become too heavy for the rising air to hold! While this is happening cold air, which is heavier than warm air, starts entering the cloud. The cold air starts to lower beneath the warm, pulling the heavy water downwards, resulting in rain. The storm at this point has become a cumulonimbus cloud. Once lightning and thunder starts to occur, it becomes a thunderstorm.
There is science to prove it.
And you cant make lightning either. Lightning is electrical discharge from clouds, when positive and negative fronts separate.
Lightning on earth however, can be generated. You can make it by having one electrically charged object on say, a positive charge. If you put a negative charge near it, a small version of lightning will appear between the two. This is the electrons travelling.
And also, do you realise how unlogical your story sounds? You sound like such a roleplayer and a fluff, no offense, but if I am anything I am honest. I dont mean to be harsh, but its the truth.
Also, electromancing would be telling the future through electricity. You mean electrokinesis, which actually exists already; many people attempt and practice it, but few succeed.
In additon, if somebody actually could do what you claim to have done, dont you think it would be all over the news and the world would know?
Sources: A+ in geography, A+ in science. With a little help of common sense.