It's all chance. It has to be raining. Lightning randomly strike a block inside a quadrant that's raining
Chat with our AI personalities
You must be admin for that
most possibly lightning but the rain will extinguish the flames. your minecraft is possibly giltched.
I've seen some people enter it in as /Smite <player> through a command block, although I'm not as sure how to do it in Singleplayer mode.
On a bukkit server, if you have permissions, you can do /thunder, /lightning, /smite or commands like /weather set storm to get the thunder/lightning effect. It all depends on the commands you have on a server. In singleplayer you would have to change the weather by doing "/weather thunder"
1. Get a stick or a blaze rod 2.get a anvil 3. get an enchanted book called fire 11 4.put the rod first then put the book in the second box