I probably should have done some more thorough searching on the subject on this forum, but...
I thought this would be cool and it would add an extra challenge if war battles were given dramatic weather... Kind of like boom beach when it rains /snows. The rain can be a little distracting which could throw an unplanned attack off. It would also give replays a different look as well.
As a secondary suggestion... War bases should have rivers of lava or obstacles that appear on planning day. This would force people to come up with more unique base designs and every battle would require some sort of rework. Thoughts!?
The second idea wouldnt really work because th9 and th 10 generally use most of the map for their bases. Plus if these obstacles were in the middle of a base, we would need more walls and things like that so im not sure it would be added