The first one near the Culinarian's Guild in Limsa Lominsa? The annoying thing about that one is the weather changes *right* when its window opens. Weather needs to turn into clear/sunny skies at 8am for you to get it :\
If it's clear before-hand, at like 7:58am, its almost guaranteed to change to a different weather.. It's obnoxious, but not nearly as bad as #18 used to be with Rain.