Horizon is a free app that tells you if you are in a floodplain and warns you when river flooding or heavy rainfall is predicted at your location. We combine daily forecasts from the Global Flood Awareness System (GloFAS), a global river model informed by satellite data, with flood-hazard maps. Since the model is global, it is especially useful in areas of the world without official flood forecasts or local weather predictions (always follow your local authorities).
