As part of my experimental sampling journey, some weeks ago I recorded a storm for a few minutes with my smartphone.
The source audio (included) could be easily processed to get some pads and atmos, but I wanted to try something different, so I made a bass drum instrument from the first thunder, processing it to get 2 notes with a longer tail, 3 velocity layers, 3 RRs and 2 dynamic layers (3x3x2 = 18 layers per note).

REQUIREMENTS:
Kontakt Full 5.8.1
200Mb HD
50Mb RAM