Thunderstorm Range

Determine the distance of a thunderstorm. When a lightning flashes then press "Start" and "Stop" when you hear the thunder. Due to the sonic speed and time measuring the distance will be calculated.

More features:
- Animation at flash (Start)
- Thundersound at Stop
- Calculation of distance of the thunderstorm

System:
- iPhone, iPod Touch, iPad
- OS 8.x or higher