Here is a way to Authenticate your app's use of the NWS (USA National Weather Service) forecasts in json format (allows you to access the weather forecast).
This code
allows you to download the json from the NWS.
When you do it (on a real device (it wouldn't work using the stock emulator)) it should look like this
Now experiment 
You may have to adjust the url to get the exact response you hope for.