along with the possobility of unaccounted factors in computer simulations as uncommonsense mentioned, electronic sirens are typically higher pitched and a few decibles quieter then mechanical sirens, and as a result don't carry as far as mechanical sirens, whch might be a slight factor in this. Alth...

probably just 2001's, it seems a good deal of michigan has had there sirens replaced. in a few days I'll be heading to the airport there, I'll notify you if theres anything else. I will note that nearby detroit has a few thunderbolts, although I'm almost sure the majority are out of service.

lol! Thanks for the awesome up-close pic of the Federal Signal STH-10. I assumed the siren atop the fire station would be involved with fire station-type duties, but now I'm wondering if the siren would also be used for severe weather? any ideas/guesses? I dont think thats an sth-10 because of the ...