WD is IMHO not creating the files behind that message. Those are server side scripts from @Curly maintained by Ken True for the Saratoga template. And they are suitable for the US only. And maybe they need to be changed with the upcoming NWS cutover.
Canada and Europe use totally different sources for the data as do some other larger countries.
In all cases, if there is a “WeatherDsiplay”-tag in the WD-taglist is is relative easy to use it.
Writing extra scripts and then adding them to the moving target “weather34” is a daunting task.
But I will put in on the " list with wishes " for the next releases.
Wim