This may help get the alert, but I cannot say for sure.
https://www.nd.gov/omb/agency/news/september-20-2018-national-test-emergency-alert-system-and-wireless-emergency-alerts-2018-09-13-0930
The WEA test message will be sent to cell phones that are connected to wireless carriers participating in WEA. This is the fourth EAS nationwide test and the first national WEA test.
In passing the WARN Act, Congress allowed participating carriers to offer subscribers the capability to block all WEAs except those issued by the President.
https://www.fcc.gov/consumers/guides/wireless-emergency-alerts-wea
http://www.fantomas-lives.com/fanto2.htm
It's good to find out ahead of time what's comming, be prepared.