Thunder in Radio!

Have you ever wondered about how thunder looks like in receiver – it is something like this.

This was recorded Friday, 13.Jul 2018 5:30pm in Finland, grid KP01tn. Radio was tuned to VLF frequency of 72,3Khz (AM). The delay between the radio interference (lines across the whole screen, left side of the video) and the lightning locator (right side of the video) is about 2 seconds.