Storm Guard is a free application that offers real-time, early-warning notifications when rain or snow is detected near your location. It is a weather detection and storm cell analysis app that provides a proximity alarm for rain and snow, weather system and storm cell analysis, short term weather forecast, weather data overlays with looping, weather station observations, and National Weather Service Alert Bulletins.

You can customize the detection sensitivity by adjusting the detection area, minimum intensity threshold, and notification frequency within the application settings. Storm Guard provides rain and snow proximity detection for continental US locations and parts of Canada. It also scans and places a magenta circle over the significant weather within the detection area, providing complete cell analysis, including average precipitation intensity, maximum precipitation intensity, storm area, and distance from your location.

The app provides a short term forecast for the area, listing any possible weather phenomena that may occur within the next three hours. You can pan and zoom around the map to get short term forecasts anywhere on the map. Storm Guard currently provides short term forecasts for continental US locations.

Overall, Storm Guard is a comprehensive weather app that provides a range of features for weather detection and analysis, making it a go-to app for weather enthusiasts and those who need to stay up-to-date with weather changes.