GL Weather
Last updated 10 October 2026
GL Weather is a weather and typhoon-tracking app for Guam, published by Kar Kulture. This policy describes exactly what the app does with information, and it is written from the app's actual behaviour rather than from a template.
The short version. There are no accounts. We do not run analytics, advertising or tracking of any kind. The only thing our servers store is your device's push notification address, so storm alerts can reach you — with no name, account or location attached. Your location is used to fetch weather for where you are, and is sent to the weather services listed below so they can answer.
If you allow it, the app takes a single location fix each time it refreshes. There is no background location tracking. The coordinates are used to request the forecast, observations and tide predictions for your position, which means they are sent to the weather services listed under Weather services.
Your location is never stored on our servers, never linked to an identity, and never used to build a profile. You can decline location entirely and choose one of Guam's villages instead; the app is fully functional either way, and the choice can be changed at any time in Settings.
All of this lives on your device (on iPhone, including the app group container our two apps share). It is not transmitted to us. Deleting the app removes it.
So that a Condition of Readiness change, a typhoon, flood or wind warning, or news of an earthquake that was felt on Guam can reach you even when the app is closed, the app registers your device for push notifications when it starts. Apple (on iPhone) or Google's Firebase (on Android) gives the app a push address for this device — a random string that works only for sending notifications to this app on this device — and the app saves it to our backend along with:
Nothing else is attached: no name, no account, no location, no contact details. We use it only to send weather alerts to every registered device at once — never to single anyone out, and never for marketing. Notifications are delivered by Apple's push notification service on iPhone and by Google's Firebase Cloud Messaging on Android. Whether they appear on your screen is governed by your notification permission; the address is registered either way, and is simply unused if you have notifications turned off.
When Apple or Google reports an address as no longer valid — for instance after the app is deleted — it is removed the next time alerts are sent. Apart from these addresses, the app's backend holds weather data only — alerts, storm tracks and the island's Condition of Readiness — which the app reads.
To answer a request, each service necessarily receives the coordinates being asked about and, as with any internet request, your device's IP address. Each has its own privacy practices, which we do not control.
| Service | Provides | Operated by |
|---|---|---|
| api.weather.gov | Forecasts, observations, alerts | US National Weather Service |
| radar.weather.gov | Radar imagery | US National Weather Service |
| aviationweather.gov | METAR and TAF | US National Weather Service |
| tidesandcurrents.noaa.gov | Tide predictions | US NOAA |
| data.epa.gov | UV index forecast, asked for by island and not by your position | US EPA |
| earthquake.usgs.gov | Recent earthquakes near Guam, asked for by island and not by your position | US Geological Survey |
| data.jma.go.jp | Satellite imagery | Japan Meteorological Agency |
| Supabase | Alerts, storm tracks, COR; stores push addresses | Supabase Inc. (our backend host) |
| Apple Maps (iPhone) Google Maps (Android) | The map behind the storm tracker and the earthquake card | Apple Inc. Google LLC |
| Apple Push Notification service (iPhone) Firebase Cloud Messaging (Android) | Delivers storm and earthquake alerts | Apple Inc. Google LLC |
The storm tracker's map and the map on the earthquake card are drawn by your phone's own map service, which receives the area of the map being shown and your device's IP address, as it does for any app that shows a map.
One of these — the Japan Meteorological Agency — is outside the United States, so requests to it leave US jurisdiction. We mention it because it is true, not because anything unusual happens to the data.
Subscriptions are sold and processed by Apple (the App Store, on iPhone) or Google (Google Play, on Android). We never see or handle your payment details. The app asks the store only whether a subscription is currently active, and receives an answer about entitlement — not about you.
Apple's or Google's handling of your purchase is governed by that company's own privacy policy.
GL Weather is not directed at children and collects no personal information from anyone, including children. The push address described above is not linked to any person.
If this policy changes in a way that affects what the app does with information, the updated date above will change and the new version will be published here before the change ships.
Questions about this policy: support@mcorpus.com