GRAT: Mountain Storm Weather

GRAT is a decision-support tool for mountaineers, ski tourers and hikers. It combines official weather warnings, high-resolution weather models and station measurements into one risk level for your position and altitude: Safe, Watch, Danger. WINTER MODE Turns on by itself when there is snow cover, snowfall, or a freezing level below you. • The lowest level reads "Low weather risk" instead of "Safe". • Fresh snow (past and next 24 hours), snow depth, time to sunset • How fast exposed skin can freeze (Environment Canada wind chill table) • GRAT does not assess avalanche danger. One tap opens your region's official avalanche bulletin. WHAT GRAT SHOWS • Shower and thunderstorm risk: at what time, according to which model • Wind gusts and feels-like temperature (hypothermia risk) • Official warnings (DWD in Germany, MeteoAlarm across Europe, NWS in the US); translate warnings in other languages on your device • Radar: our own radar for Europe (EUMETNET OPERA and DWD), NOAA in the continental US • Map with shaded relief and contour lines (Copernicus DEM) • Pressure trend from your iPhone's barometer COMPANION MODE Start it before you set out: GRAT re-evaluates the risk regularly along the way and sends a notification when it rises. No notifications are sent while the app is closed, and delivery depends on iOS and may fail. Distance and barometer measurements pause automatically while you drive. At the end of the trip you can mark whether the alerts were accurate. TO BE HONEST • GRAT does not make decisions for you; your own observation and experience always come first. • Without data the app does not say "safe" — it says "cannot be evaluated". • No alerts are sent while the app is closed. PRIVACY No account, no ads, no tracking. Your location is rounded to about 110 m. Forecasts and radar come from our own data server, which does not store your location or your IP address. GRAT PRO Core risk information (risk level, official warnings, radar) is always free. Pro adds unlimited Companion Mode (free: 2 trips per month), offline route forecasts, full history with export and the Live Activity. Monthly, yearly (14-day free trial) or a one-time lifetime purchase. Family Sharing included. Terms of Use (EULA): https://gratweather.com/terms/ Privacy Policy: https://gratweather.com/privacy/