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thunderstorm thunderstorm lightning thunder press when you see the lightning clear works offline loads faster no ads works offline loads faster no ads ad supported freeware this application calculates the distance of a thunder storm by measuring the time between a lightning and the corresponding thunder how to use when you see the lightning press the lightning button wait until you hear the thunder and press the thunder button tap the distance to toggle between metric and imperial units with the help of the history list you can see whether the storm comes closer and moves away background the speed of light is much faster than the speed of sound by measuring the time between the lightning and corresponding thunder one can easily approach the distance by multiplying the duration with the speed of sound related applications compass find out where to go sunrise worldwide sunrise and sunset times morse code send morse codes with a blinking phone wind the current local wind speed and direction more iphone applications version 1 0 0 piet jonas 2010 contact thunder speedymarks com privacy