Lightning (an electrical discharge) always travels faster than the speed of sound. Lightning moves at thousands of miles per second through the air. The energy heats the air, to many thousands of degrees in temperature, and the rapid expansion of the air creates sound waves, called thunder. These sound waves travel through the air at about 1/5 of a mile per second, so that at any distance away from a lightning strike, the flash is seen before the thunder is heard.
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