Is not that correct, Cumulonimbus cloud is responsible for the 80% of Cloud to ground Lightning. If we can predict the formation of the cumulonimbus cloud, it will me more or less predicted the occurrence of lightning. For, Example, in my country Nepal, I had done research on the occurrence of Positive and Negative Lightning, which shows that in Pre- Monsoon season ( March April and May) lightning occurs most. Another research also shows that lightning depends upon the temperature and humidity. These all depends upon the latitude and longitude of the place also. However, Nepal and USA are geographically different.