I did some further research. The SmartThings SmartWeather Station Tile data source was switched from the WeatherUnderground (WU) to The Weather Company (TWC) in Jan of 2019.
This smartapp is not updating my PWS weather anymore. I think its because of this post that I found:
Weather API Changes
Announcements
Dec 2018
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Dec 2018
3h ago
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SmartThings Staff Member
25d
The WeatherUnderground (WU) APIs SmartThings has been using to access local weather data are being shut down at the end of this year. This means any Automations or Devices that use the getWeatherFeature() method will stop running or begin returning errors on January 1, 2019.
We are taking steps to ensure that the SmartThings SmartApps and the SmartWeather Station Tile device handler will continue to work by porting them to new APIs from The Weather Company (TWC). These will be released into Production this week and there will be no gap in performance. To maintain your SmartApps an…
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