© Google Maps
Hundreds of residents are still unable to explain the source of the 20-second roar.
The noise was first reported after a Huonville dam bank burst on July 15, causing the evacuation of 100 residents.
"It woke me up about 10pm we had no idea what was going on at the time but in hindsight maybe it was the dam breaking," a Scenic Hill Drive resident said on July 16.
But the council said the noise would not have been caused by the dam incident.
The Mercury yesterday spoke to local police, retailers and council employees in the Huonville and Cygnet areas after being contacted by concerned residents wanting answers. Everyone heard the noise but no one knew what caused it.
The Bureau of Meteorology says it was most likely a particularly extreme thunder blast.
"But it sounded very different to thunder," unconvinced Cygnet resident Kamal Singh said yesterday.
"My partner and I were lying in bed asking 'what the hell was that'."
Bureau duty forecaster Philip Perkins yesterday analysed the weather forecast for July 15 in the Huon Valley region and found possible thunderstorms were forecast for the afternoon and evening.
Supersonic aircraft are also known to make a noise similar to what residents have widely described, but the defence department says it had no aircraft in Tasmanian air space that night.
Reader Comments
to our Newsletter