Storm Shield uses iOS Location Services to track severe weather wherever you travel and sends you severe weather alerts for your current and saved locations, and to display your location on the map (for more information on Apple Location Services, click here). Storm Shield only uses location information for this purpose. The app does not maintain a history of location information nor combine location information with any personally identifying data.
Storm Shield uses the Significant-Change Location service (that uses a combination of GPS, cellular networks, and WiFi networks based on signal strength and availability) of iOS Location Services in order to notify you of weather alerts for your current location. This provides a low-power way for apps to get a device's current location without using GPS and still be notified when significant changes occur. This has a minimal effect on battery life. Battery life depends on a variety of factors such as the version of iOS your device uses, the age of your device and its battery, and other apps using your location.
A "significant change" in location may be detected at 15 minute intervals, and within an area diameter of 100-500 yds.