There's a reason they made it automatic.
There was a false alarm of the old EBS system (predecessor to the modern EAS) in 1971 (you can find a recording of it) and the problem they had was that lots of stations just ignored it, because it happened at the same time as regularly scheduled tests (due to how it happened).
I found a web-SDR that covers AM broadcast in the US
http://websdr1.sdrutah.org:8901/index1a.html?tune=1160am
Another one, this time in DC itself
http://na5b.com:8901/
If it happens, you'll here it on stations here.
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It's been like this for many minutes