I know we dont have a storms or stormy domain, but talos 's symbol features lightning and I even remember an old talos specialist priest (2nd edition D&D) having storm based powers.

So how about talos getting access to AIR domain as well in place of STORMS?

Just like kelemvor gets DEATH in place of repose, and some other deities get LUCK in place of fate.

I think the idea is that "storms" don't happen in the Underdark. That being said, there are still pleny of "natural" disasters that can happen down here. I think Talos' domains fit just fine.

It's something of a moot point, as Call Lightning has been replaced with the Cave-In version.

which is destruction in it's own right!!!

Though yes talos's destruction would take other forms than storms in the underdark, a collapsing cavern would be exactly the sort of thing a talosian would like to see.

I just think it fits.

Having the call boulders spell there for air domain might not fit, but since it IS in there, it'd definitely fit talos.