i dont see why not, if FFXI could have Lightning elementals
pop in Jugner forest when it rained why cant FFXIV?

Same thing for Kreutzet, popped when double Wind weather.
(or atleast had high chance of popping, cant remember if it was 100% or not)

I think this is one of the things i miss in FFXIV, the camping of NM's.
NM pop timers / requirements etc.