http://www.federalwarningsystems.com/products.php?prodid=2 ODESS has spoken!
First it was just a notification that the following was a test.
Then came several announcements like This for example
The messages varied, all pre recorded and all precluded by the siren you heard above.
One was about a Tsunami approaching, advising people to get to high ground.
Others were about Hurricanes or Tropical storms approaching in varying degrees like Yellow alert,
Red alert etc. Then there was one or two giving the all clear.
One question was answered.....ODESS is a God, not a Goddess!
D
P.S. let me know if the sound works for you.