Quote from Darknova009
You can just delete/change the thunder.
Search on your computer %appdata% -> then go to "Roaming" -> then ".Minecraft" -> then "resources" -> then "newsound" -> then "ambient" -> then "weather" -> and now delete the thunder sounds. :smile.gif:
The game will replace it. You have to put a non-working file with the exact same name (and extension) then make it read-only to stop Minecraft from fixing it.