Lightning - 1.1
Lightning is a simple application that takes the drugework out of calculating how far away a lightning storm is. Sounds travels at approximately 1100 feet per second. So it takes about 5 seconds to travel 1 mile. This little app takes the work out of calculating that distance.
Due to the way sound travels through the atmosphere, this method isn't much good over 20 miles. So the timer will stop at that point.
This will also work for fireworks, or other explosive events (like say, an episode of MythBusters). Due to the 20-mile limit, it is not recommended to use this application to determine the distance of a nuclear explosion...
Before the flash
This is the entry screen. Just wait for the flash of lightning, and tap the top button. The timer will start and the disatnce number will start counting up.
When you hear that first peale of thunder, tap the bottom button. The timer will stop, and your approximate distance from the lightning strike will be displayed.
In the danger zone
According to guidelines published by the National Lightning Saftey Institute (
link),
you should suspend outdoor activities and take cover when lightning is within 6 miles. The distance numbers display in red with in this zone.
This is not to imply that you're safe outside of 6 miles. People and objects have been struck by lightning nearly 30 miles from the visible storm center. So take extreme care whenever you hear the rumble.