It looked like a snaking monster bellowing down from the sky with a large open mouth ready to devour anything in its way, to the left of this astounding looking cloud a rainbow developed and then disappeared within minutes.
I’m sure there are many cloud spotters out there that will know what type of cloud this may be, the closest that I can find is from the Cumulonimbus family…whatever type of cloud it was, it was quite astonishing :-)
Image taken on the 8th November 2021 with a Canon GX7 Mark 11 camera on manual focus, with an ISO125.