Forth is about 6 miles north from The State Hospital in Carstairs, which is a high security hospital for people that pose a high risk to the general public.
The siren network warns residents in nearby towns of, quote "persons unaccounted for" which could also mean an escapee.
There are essentially WWII air-raid siren technology manufactured in the 1950s/60s. These are still running today! Please visit my other siren videos (including Broadmoor) by clicking on the links below.
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SIREN MERCHANDISE now available from http://www.mrmattandmrchay.com
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OTHER QUALITY SIREN VIDEOS:

THE HAUNTING SIREN OF RAVENSTRUTHER:
   • The Haunting RAVENSTRUTHER SIREN TEST...  
BEST BROADMOOR SIREN VIDEO:
   • Your favourite BROADMOOR SIRENS in ac...  
CARSTAIRS (Playlist):
   • NEW SIREN HUNT! - The State Hospital,...  
BROADMOOR SIREN PLAYLIST:
   • (2018) The last ever BROADMOOR SIREN ...  
ALEX'S SIREN 'G' SIREN (Carstairs Primary School) VIDEO HERE:
   • Carstairs SIREN G TEST! Carstairs Vil...  
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This video is the FIRST siren from my Carstairs siren hunt (not the Forth ...uhm, get it? Yeah I suppose it wasn't that funny anyway!!).
Don't forget to see the slo-mo 'shaking' siren start up at the end of the video (love the 'shimmering' effect!)
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THE MRMATTANDMRCHAY CHANNEL, established 2009:
I'm passionate about uploading quality and interesting videos for YOU, my audience.
What is my channel about? "Old lift machinery made interesting", old air-raid sirens, prehistoric alarm equipment - things that I find fascinating and I hope you will too. If "I" don't find it interesting - IT DOESN'T GET UPLOADED!
I always spend a lot of time editing my videos with animations, video in-sync with music and voice overs to make them this way. I'm also a perfectionist!
My moto - "Quality NOT Quantity" - spending a month editing a video is not a rarity!
But without you, I'm nothing here. Thank you so much for watching.
...mrmattandmrchay is me (Matt) and my son Chay.