Stormtracker is an interactive, animated map with 5 possible layers that can be loaded:
My location: to see where your location sits in the map
Storm - Select this option to see if there is any Storm building up in the area and follow it's movements.
Lightning (Available to Pro members only) will give you live lightning information in the map
Satellite layer will display a satellite view of the map (instead of terrain)
Borders layer can be switched on and off.
All options above (Or any combinations ) can be selected at once.