The best thunderstorm I've seen is when I lived in Cyprus. Seeing the lightening reflection in the sea is immense. So warm yet pissing down.
Three years ago in Rhodes I was sitting on my balcony drinking wine and watching a fantastic thunderstorm out at sea, it went on for about two hours, it was ace, then about 11pm it finally hit the island and immediately scored a direct hit on a power station nearby, the blast (maybe shock of the noise) knocked me straight off my seat and threw me through the balcony doors. No electricity for the rest of the night and the island in total darkness with this ragging storm overhead was flipping scary.