If you turn on Lightning storm to watch the worry panda being worry, the lightning function doesn't seems right for me. It lights every 1 one second in the same chunk, and it happens so frequently. If I happened to stay in my place for 30 seconds I would get hit by lightning in a rate of 70%. I spawned punch of pandas and turned on the lightning storm, but it was lightning a lot in the same chunk, and I would see the pandas in the chunk getting hit by the lightning every 10 to 15 seconds. I think this is a bug, but I am not sure. 

Video of the issue: https://drive.google.com/open?id=1IS2LW0ShPj06l_cUtUlXEjmmsz60773-