Board Thread:Suggestions forum/@comment-25981649-20161230205228/@comment-28440866-20170101211713

Within the ash clouds of a volcano (Mt. Doom in this case) it is a common phenomenon to see lightning bolts. These are created when dust and other particles are electrically charged. I used the word "within" for a reason. This sort of lightning does not reach the ground but remains within the ash cloud. So reasonably, lightning in Mordor wouldn't make sense.

Now, Mount Doom was a volcano that after it's reawakening in TA 2954 sporadically erupted until the end of the Third Age. At the moment, this is not a feature in the mod. But what if we took the ordinary rain/thunder cycle from the game and transformed it into a pretentious "volcano eruption" in  Mordor (instead of there being no rain in Mordor at all). All that is needed is ash particles instead of rain. This would also justify lightning in Mordor.

https://en.wikipedia.org/wiki/Dirty_thunderstorm

http://tolkiengateway.net/wiki/Mount_Doom