Now, Earth Networks has released an update with enhanced Spark Lightning detection. As before, you'll get a warning when lightning is less than 10 miles away, and now you can zoom out to see lighting anywhere in the world in real time. The look of the map has been improved over earlier versions, too.
The company claims its Total Lightning Network is the most advanced system in the world, and it's used by NASA, the National Weather Service and the U.S. Air Force. This latest version now lets you share lightning info with others.