To determine how far away a lightning storm is from you, National Geographic Kids says you can count the seconds between the flash and the crack and watch for the flash of lightning from a safe location. Time how many seconds elapse before you hear thunder. Divide the number of seconds by five and the answer is the approximate number of miles away.
To determine how far away a lightning storm is from you, National Geographic Kids says you can count the seconds between the flash and the crack and watch for the flash of lightning from a safe location. Time how many seconds elapse before you hear thunder. Divide the number of seconds by five and the answer is the approximate number of miles away.