It's already color-coded and has been since the beginning of NF on this server. The problem for some people is that it's a mix of light blue/green/red and white, so the blue and greens get washed out and are sometimes hard to differentiate.
Yes I mean the main color of the storm due to happen many time people ask in fight who drop it. I think will not hard to do and was more clear as happen with TWF
They could add an additional asset to it, like f.e.: (Cloud-)Storm vfx (red/blue/green) from ToA Masteries. Maybe something else.
For me, i can differentiate them pretty easily,thanks to my GPU? Display? i guess. Seems its not like that for everyone. Same with the /effects self/non/group. idk.