The Weathernow Roku app seems to be a weather app that has interesting possibilities. Two changes that would improve the app is a settings option that allows you to input zip code or city and state option instead of just a city option as there are cities with the same name in multiple states and countries. The second change is to have a settings option that allows you to change temperature from Celsius to Fahrenheit.
You need to contact the Weathernow developer for your suggestions. Roku has little to do with how most channels/apps work.