This video features a NOAA All Hazzard Radio broadcast, EAS tones, test message, and a siren that I'm pretty sure is an STH-10 sounding the Alert signal. I'm visually impaired, so I can't see the siren, so please correct me if I'm wrong.
http://youtube.com/watch?v=W_o_WfzEMqY
Very long wind-down at the end.