For anyone curious, the thunder audio is created on-the-fly here: https://github.com/wybiral/storm/blob/master/js/index.js#L22 https://github.com/wybiral/storm/

For anyone curious, the thunder audio is created on-the-fly here: https://github.com/wybiral/storm/blob/master/js/index.js#L22 https://github.com/wybiral/storm/blob/master/js/index.js#L22 Basically it creates a "boom" from brownian noise and then decays out the higher frequencies.