I found this incredibly loud whistle while putting together a disaster preparedness kit for my car. I did some non-scientific testing against my Fox 40 (rated 115 decibels) by having my son blow into each of them across a soccer field. The Storm (rated 118-120db) definitely sounded louder (decibels are based on a logarithmic scale with a base of 10, so the Storm’s decibel intensity is almost 3 times the Fox 40). It is also advertised as working underwater (the chambers clear as you blow). I haven’t tried it underwater yet, but regardless, this is the loudest whistle I have ever heard.
– Mark Chow-Young
Available from Amazon
Manufactured by All-Weather Safety Whistle Co.