Both actually, it depends on which one is holding the positive and negative charge, electrons flow from neg to positive. Another thing people don't understand is the streamer or leader which is basically a "conduit" of ionized air that created the conductor for the charge to flow.
http://science.howstuffworks.com/lightning5.htm
Intellicast has a map available depicting the polarity of strikes, it's cool the way it works with different frontal boundries especially in times of storm rotation (tornados).
Here;s a cool earth to cloud vid!
http://www.youtube.com/watch?v=bNhY3...eature=related
Chad
Bookmarks