The entire idea of the application is to give an overview of the last 24 hours. Only data (such as positions and tweets) related to the last 24 hours is published. Positions of any storm spotters are kept for maximum 48 hours and are then deleted.
Your GPS positions are broadcasted from software applications such as RadarScope and GRLevelX (see SpotterNetwork.org for a full list of applications broadcasting GPS data to SpotterNetwork) on your phone or computer to SpotterNetwork, where it is stored and made public. StormWindow uses this (public) data to show positions of chasers. GPS data is only broadcasted if you have accepted to 'Report location' (or equivalent setting) in these software applications.
In order to only show GPS while actively chasing, choose to activate the 'Report location'-setting only when you head out to chase. Turn it off when this information is no longer needed to be broadcasted.
You can always request a removal of your data from StormWindow by emailing email@example.com with the name (as given in SpotterNetwork) and your Spotter Network public ID. In order to attain your Spotter Network public ID log in to https://www.spotternetwork.org/login and you will see this information in the 'Spotter Information' table.
By choosing to completely remove your data, your SpotterNetwork account will also be ignored in further retrieval of data to StormWindow. Please NOTE, however, that this will NOT stop GPS data from being broadcasted from software applications to SpotterNetwork.org. Your GPS data could still be public (only not used in the StormWindow application). In order to not broadcast your GPS data, you need to adjust the 'Report location'-settings of SpotterNetwork affiliated software applications.
In order to not have your tweets being shown publicly you can choose to make your Twitter account 'Protected' (refer to Twitter documentation). If you want your tweets to not be published on StormWindow without making your Twitter account 'Protected', please contact @stormchasingusa in the Twitter messaging system and ask for a removal. If you do not want to broadcast the geolocation of your tweets, make sure you do not actively choose to provide this information while publishing a tweet (refer to Twitter documentation).