It is easy to calculate the distance of a thunderstorm. Just start counting from when you see the flash and stop when you hear the thunder. Now divide the time by ~3 in order to find out how many kilometers away the thunderstorm is (~ for miles).
![Thunder Buddy - Measure & visualize the lightning distance [Android App] screenshot 2](https://i.ytimg.com/vi/jQ5uotJo_Ts/mqdefault.jpg)
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