User blog comment:Mangetsu20/Cliches and Build-Up (FT - 484-485)/@comment-3030647-20160518042517

Mostly irrelevant to this whole discussion, but, I do have a small theory.

Judging from the rock faces/formations on Zonia mountain in that one scenery page Hiro had (well-drawn, btw) and the fact that they had text of some sort on them, there are two ways Irene could have changed the climate.

Either:
 * 1) She just did because yay Spriggan 12 OPness. (I mean, it might be the most likely but who knows.)
 * 2) If we link her back to Erza and the idea that Erza dispelled Neinhart's Historia (don't get mad at me for bringing up previous facts, I hate it as much as you do), and take her story of the White and Black Angels as fact, then, Irene actually dispelled the Magic that had bound Zonia to snowy weather via the writing on the rock faces (akin to runes, or something). Hence, a dispelling ability rather than the more potent ability to actively change the climate on a whim.