This is a basic Windows 8.1 store app which lets you point your device at lightning and press a button when the light is seen and again when the sound is heard. This gives distance, from time of flight, and direction from the aiming.
The lightning positions are plotted on a "radar" screen and rotated, when the device rotates, to maintain relative direction. You can use pinch to zoom to scale the "radar" screen.
This project was primarily made as a simple project to let me get to know WinRT and the Windows Store setup a little better.