As sz4kerto said, it was probably tracked by building systems. But beyond that, weather services track every single lightning strike in most of the developed world. Eg BELLS: http://radar.meteo.be/en/3337408-Lightning+detection.html#pp...

This is how, for example, you can know whether a wildfire was started by lightning - once a point of origin is determined, simply check the data for strikes.

https://en.wikipedia.org/wiki/Lightning_detection http://www.lightningmaps.org/