Found this CD Suburban thunder which was used for the background sound in the movie Pirates of Caribbean. Since all of us heard the sound of thunder and storm I hope this will be useful to see how well my system recreates the acoustics of a thunder storm as natural as possible.
That also remind me of another CD (the sound of waves) which frightened and disoriented my 3 year old son when it was played. It was fun watching him climbing up on the chairs and looking for waves on the floor!!