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Here in the North East Ohio area, the local NOAA service makes their various audio clips available for download. They break them up into current weather, forecast, long term forecast, maritime forecast and so on.
This is great as I have automated the process. Every 15 minutes my system downloads from NOAA. The file names remain the same so the Zara play list remains the same. I always have current weather info and it plays on cue.
Zara imports current temperature and humidity from Weather Watcher Live for automated time/temperature announcements. Weather Watcher Live also plays an audio file when a weather alert is issued. That audio simply overides the current Zara audio notifying listeners of an alert.