Now for some fun calculations to figure out how far away we were. It looks like it's about 25 video frames from the first flash to the sound hitting the camera. The framerate is approximately 30FPS. At -20C sound travels at 318.942 m/s. So: (25/30)* 318.942m/s = 265.785m away. Or we could just use Google maps which gives 256.46m... pretty close!