The Siren Board

Seabrook NH last "demonstrated" their 3016's and 4008's back in 2012...five years ago. Is there any reason they haven't sounded them for so long?

They also apparently silently tested them every two weeks or so.

I believe the individual towns are now in charge of when they test. I haven't found any of the schedules, but a friend of mine on Hampton Beach said he hears them all the time. In Portsmouth, the sirens change position occasionally (though I've never caught them in the action, lol), but they always end up back in their home position, facing to the southwest. They do silent test them regularly.

The sirens get weekly silent tests, all initiated from Seabrook Station and Rockingham County Sheriff's Office Dispatch. There are multiple control points throughout the county, primary being Seabrook Station itself, Rockingham County Sheriff's Office, and State of New Hampshire IPOC in Concord. Individual fire departments within the 10 mile EPZ have encoders as well that they can use as additional control points and for local warning/alerting.

The only reason they had a full test was as part of a public demo, as no one had heard them for many years. There is nothing that can't be gleamed from the silent tests they do weekly to track down problems. The sirens communicate back to Seabrook Station via DTMF for errors/issues. The siren maintenance group also does yearly PMs on the sirens, so they get a hands on pretty regularly as well.