I did this one way back in 1999, still one of my all time favourites.
You will probably notice a bolt of lighting shooting out ahead of the storm. The reason for this is that I was at a friends house, and went outside to watch a large thunderstorm roll in.
It was still sunny, and the clouds weren't even over the area yet, and all of a sudden fzzzcraaaack! A small bolt of lighting hit the top of a tree just across the street from me.
I say 'small' meaning to say it didn't split the tree in half, but it was certainly loud! inside my friend came out to see if i was alright and the TV in the house was busted!
So that is why I added the lighting to this piece!