Meteobridge is not blocking certain files. If a file has been generated to this folder it can be accessed via HTTP. "/var/data/" is a temporary filesystem kept in RAM, so data will be lost after a reboot. But as you said, both files where there. So I don't have an explanation. Please check if your assumptions regarding existence of files are right. May be you overlooked something.
I can assure you that both files are permanently siting in /var/data/html. Templates that are generating these two files are sitting /var/data/templates. I monitor these folders using WinSCP
So what could be wrong?