Due to new requirements for apps starting with iOS 5.0.1 the GRIB files downloaded by WeatherTrack version 1.4 and up are not stored in your iTunes backup nor in your iCloud backup any longer. Therefore we recommend that you use the iTunes file sharing feature to archive any GRIB files needed in case your device is lost. We repeat here the instructions also found in the in-app guide under “Managing GRIB Files”:

You use the iTunes application on your desktop computer to manage GRIB files displayed by the WeatherTrack app. Connect your iPhone to iTunes. You do not need to sync, but look at the left side of your screen and click the device. Now go up to the title line, choose apps and scroll all the apps down until you see the file sharing section. Look for WeatherTrack in the list of apps offering file sharing. Click on this app and in the list of documents to the right all downloaded GRIB files will show up. Choose the one you want and click “add” or “save to”. You can also drag and drop files from the Finder here, no sync needed. Simply click on the WeatherTrack icon in the app section of iTunes and you see the list of files from WeatherTrack. Again, you can delete files, add files from your desktop computer and copy files downloaded using WeatherTrack to your computer simply by drag and drop.