Thunder & Rain is a sound library that delivers the recordings of two storms. It includes a total of 46 audio files, split into three folders: STEREO, MS and UPMIX 5.1. It also comes with 40 audio files in the AS REC MS (NO De-Noise) folder.
De-noise was applied to most of the recordings, to only preserve thunder FX, but you have the NO De-Noise folder included too.
Create your own thunder ambiences with the included Winds/Storm/Rain files (in the preview below, I used the Rain file in addition to thunder files).