The cause of the low frequency sound generated by the tornado is almost specified
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It has been known for decades that low-frequency sounds are generated when tornadoes occur, but the cause of how the sounds are sounding has long been unknown. Dr. Brian Erving of Oklahoma State University, who is studying tornadoes, announced that the cause has been narrowed down to three.
Mystery sounds from storms could help predict tornadoes | World news | The Guardian
https://www.theguardian.com/world/2019/nov/25/mystery-sounds-from-storms-could-help-predict-tornadoes
According to Dr. Elving's latest research results presented at the General Meeting of the American Physical Society Fluid Dynamics Division , low-frequency sound occurs before the tornado touches the ground, continues while touching the ground, and away from the ground for a while Since it disappears, it is thought that it is one of three of 'tornado core vibration' 'pressure relaxation' 'latent heat effect'.
In an experiment in Oklahoma, we detected an audio signal 8 minutes before the tornado occurred and succeeded in detecting a clear signal 4 minutes before the occurrence.
According to Dr. Elving, the time required to detect a tornado is proportional to the size of the tornado, so the tornado that occurred during this experiment was small, so it was detected 4 minutes ago and immediately before, but at most 2 hours The previous detection is possible.
by Ben Klea
As for the location, it was detected at a distance of 12 miles (about 20 km) in the experiment in Oklahoma, but if the understanding of the signal deepens, it will eventually be detected even if it is 100 miles (about 160 km) away Dr. Elving looked forward to it.
Dr. Harold Brooks, a specialist at the Ocean and Atmosphere Bureau, who has not participated in Dr. Elving's research, does all tornados produce similar sounds, or whether they occur from storms other than tornadoes, etc. , The view that further research is needed.
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