The link seems to go to alerts.weather.gov and not alerts-V2.weather.gov.
Are you running advforecast2.php Version 5.04 - 11-Oct-2017 ?
Is $useProdNWS = false; // =false, use preview V3 sites,
set in the script?
If so, then if ($useProdNWS) {
// final production URLs
define('APIURL', "https://api.weather.gov");
define('FCSTURL', "https://forecast.weather.gov");
define('ALERTAPIURL', 'https://api.weather.gov/alerts?active=1&zone=');
define('ALERTURL', 'https://alerts.weather.gov/products/');
}
else {
// pre-production/testing URLs
define('APIURL', "https://api.weather.gov");
define('FCSTURL', "https://forecast-v3.weather.gov");
define('ALERTAPIURL', 'https://api.weather.gov/alerts?active=1&zone=');
define('ALERTURL', 'https://alerts-v2.weather.gov/products/'); // TODO: fix this to final loc.
}
should set the alert URL to use the beta product site.