... " If you have installed World Update 12 New Zealand, which I assume most people will do, I think Milford Sound looks best right now if you uninstall Orbx NZ Mesh.
(That should remove both Orbx-mesh-new-zealand and z_airport-nzmf folders from the Community folder.)
If you want to keep Orbx's NZ Mesh installed for another reason, I still recommend manually removing the z_airport-nzmf folder. That will fix issues at the airport.
Removing the Orbx-mesh-new-zealand folder will remove the Orbx mesh from all of New Zealand. It also fixes the current water on the hillside at Milford Sound." ...
NZ has only 3 weather stations available to the public without buying subscriptions from NZ Met service. So interpolation is not accurate anywhere in NZ,
outside of NZCH NZWN NZAA.
Mostly, Developer 3rd party - NZQN Airport issues, not fully compatible with WU 12.