Hi there! I understand you're having trouble with the First Alert Weather app radar not showing rain on your iPhone with iOS 18.6. To help you better, could you tell me a bit more? For example, is the radar map completely blank, or do you see the map but just no rain? Also, have you tried toggling any settings or restarting the app?

Meanwhile, here are a few simple steps you can try to get the radar showing rain again:

1. Check Radar Settings: Sometimes the radar might be set to show "future forecast" instead of current precipitation. In the app, make sure the radar is set to show past or current precipitation rather than future radar.

2. Toggle Precipitation Display: In the radar screen, try toggling on/off the Precipitation layer if available. This typically refreshes the radar overlay showing rain.

3. Restart the App: Close the First Alert Weather app completely (swipe it away from the app switcher) and then open it again to refresh content.

4. Check Location Permissions: Ensure the app has permission to access your location so it can show accurate local radar.

5. Update the App: Make sure you have the latest version of the First Alert Weather app installed on your iPhone from the App Store.

6. Internet Connection: Confirm you're connected to the internet via Wi-Fi or cellular, since radar data needs an active online connection.

If you've done those, there could also have been a temporary issue with radar data updating on the app side, as has happened in the past and was fixed by their developers.

Try these steps and let me know where you get stuck or what you see—I'm here to help you get it working! Are you able to see the radar map at all, or is it just not showing rain?