This is why you don't want to stand under a tree during a thunderstorm!
This oak tree was struck by lightning outside my school in 1999. I live nearby and I saw the flash as I was cooking supper. When I heard the crack of thunder immediately after seeing the flash, I knew it had hit somewhere very close by. The next day I found out where it hit! The lightning blasted a 10 foot-long strip of wood from the inside of the tree (see left photo) and the bark was separated enough that I could put my hand between it and the tree. The intense heat of the lightning (54,000 degrees F) literally explodes the bark off the tree when the water is flash boiled! Sadly, it died and had to be cut down. It had been a wonderful shade tree on one of the playgrounds.
This is a scanned photo of pictures I took with my film camera.