Apps in this category may contain mild or occasional cartoon, fantasy or real-life violence, as well as occasional or mild adult, sexually suggestive or horrifying content and may not be suitable for children under 9 years of age.

12+

Apps in this category may contain occasional mild indecent language, frequent or intense cartoon or real-life violence, minor or occasional adult or sexually suggestive material, and simulated gambling, and may be for children under 12 years of age.

17+

You must be at least 17 years old to access this App.

Apps in this category may contain frequent and intense offensive language; Frequent and intense cartoon, fantasy or realistic violence: frequent and intense adult, scary and sexually suggestive subjects: as well as sexual content, nudity, tobacco, alcohol and drugs, may not be suitable for children under 17 years of age.

Thunderstorm Calculator 螢幕截圖

iPad

iPhone

About Thunderstorm Calculator

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.

Apple Watch version:
- distance calculation
- history list
- metric and imperial units
- has a Check for a quick start