This means that you hear thunder before seeing the lightning. 5 km/hr = 4.56 ft/sec. so lightning is seen 1157 seconds or 19 minutes per mile. as opposed to t

This means that you hear thunder before seeing the lightning. 5 km/hr = 4.56 ft/sec. so lightning is seen 1157 seconds or 19 minutes per mile. as opposed to the usual zero. Sound travels 1100 ft/sec and is heard the usual 5 seconds per mile after the strike, but 19 minutes before the flash. Per mile of distance away.