Originally Posted by
helicrazi
TL isn't regulatory, tail wags dog
I didn't say regulatory, I said driven by the regulator. The rules we work with are not in regulation, but the Met Office tool and the associated ruleset are all put in place with CAA oversight, encouragement, etc.
212man makes reference to TIGK. This was the start of a very long journey. Some of the initial research was very interesting, including that TL was mainly "positive" rather than "negative" and carried much more energy than traditional lightning. The positive lightning strike energy far exceeded the certification requirements back in the 90s, and I suspect still does.