When you click on a weather station on the map, the UI/app will record the GPS coordinates and that’s the data it stores to the firmware. However, the location will still show city/state because showing GPS coords is confusing.
The reason the firmware uses an external script to resolve weather information is that the controller is not capable to parse weather data itself. In addition, using an external scrip allows us to improve or provide additional weather algorithms in the future without the user having to update firmware.