Hello! I understand your Storm Radar app on your iPhone with iOS 16.6.1 isn't consistently showing radar data, the six-hour forecast isn’t working, and lightning marks aren’t appearing. Let’s see if we can get everything back in order for you.

First, let me ask a couple of quick questions to better understand your situation:
- Does the radar fail to load immediately when you open the app, or does it stop working partway through usage?
- Are you connected to Wi-Fi or cellular data when this happens?
- Have you checked if your Location Services are enabled for the Storm Radar app?
- Lastly, have you tried any troubleshooting steps so far such as restarting the app or your phone?

Here’s a simple step-by-step plan to try:

1. Check Location Services:
Go to Settings > Privacy & Security > Location Services. Ensure Location Services is turned on and that Storm Radar is set to "While Using the App" or "Always." This ensures accurate radar positioning and lightning markers usually rely on location data.

2. Network Connection:
Switch between Wi-Fi and cellular data to see if the radar loads better on one. Sometimes network interruptions cause issues with loading forecast and lightning data.

3. Restart the App:
Double-click the Home button or swipe up from the bottom (depending on your iPhone model) to open the app switcher, then swipe the Storm Radar app off-screen to force close it. Open it again fresh.

4. Update the App:
Open the App Store, tap your profile icon, and scroll to see if there’s an update available for Storm Radar. Updates often fix bugs with radar or forecast display.

5. Restart Your iPhone:
A simple restart can clear temporary issues that interfere with app functions.

6. Clear Cache and Data (if possible):
Storm Radar itself may not have a direct cache clear option on iOS, but reinstalling the app can help:
- Delete the Storm Radar app
- Restart your iPhone
- Reinstall the app from the App Store

If after all that, your six-hour ahead forecast and lightning markers still don’t work, the issue may be with either your account, app permissions, or occasionally server-side problems for the app provider.

Please let me know which of these you’ve tried or if you’d like me to walk you through any step more carefully! Also, if you see any error messages or unusual app behavior, that info can help us pinpoint the problem.

Are you satisfied with this approach so far?