It appears to be an issue with the NWS and api.weather.gov not having a current point forecast for your specific gridpoint.
The detailed point forecast weather data is not currently available. The zone forecast data for MEZ020 (Androscoggin) will be displayed until the point forecast data is again available. If this persists, contact the NWS Gray - Portland, ME WFO at 207-688-3216 or email at [email protected] to have them update the point forecast for /gridpoints/GYX/70,85 on api.weather.gov
This happens at various times for various regions. It’s likely that this issue may be delaying their cutover to the new API-driven forecast.weather.gov site. I’ve found that calling the phone number is likely to get a response more than the email address. All the pertinent info about the gridpoint in error is in the message above.
Meanwhile, you can ‘downgrade’ your advforecast2.php script to V4.05 and use the older page-scraper script which is more reliable (at this time). Note that you’ll only have a single row of icons as the current forecast.weather.gov doesn’t have as many days in the forecast as the API/forecast-v3.weather.gov shows.